Olight
Page 5 of 7 FirstFirst 1234567 LastLast
Results 121 to 150 of 209

Thread: Best rechargeable "D" cell

  1. #121
    Flashaholic*
    Join Date
    Nov 2009
    Location
    Chesapeake, VA
    Posts
    646

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by drmalenko View Post
    357mag1 did you get my pm?
    Just got it. I didn't notice PMs piling up in my inbox. Thanks for the heads up.

  2. #122

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by 357mag1 View Post
    CyberCT,

    Current in series is common so whatever current is at the tailcap all cells are felling that draw. In the case of the TK70 all three cells are feeling the 9.84amp draw (from my test). With 4 cells it drops to 6.25amps and again each cell has that current drawn through it.

    My Newer TK70 draws 10.7amps on 3 cells and 7.2amps with 4 cells.
    You know, I'm thinking about the LION option. If the TK70 steps down from turbo to high when only 3.8v is available from the batteries, wouldn't a LION step down too soon? If you charge 2 LION 32600 cells to say 4.2v and then use them in the TK70 the TK70 would step down when the LIONs are only what, 70% capacity remaining? Because LION cells are rated at 3.7v.

  3. #123

    Default Re: Best rechargeable "D" cell

    Did a runtime test of 4 of 8 Tenergys fresh off "soft" "condition" mode from my Maha 808S charger. 1 hour 2 minutes till the light stepped down from turbo to high. You can hear the driver in the light at the end squealing. It sounded like a dive bomb and then went silent haha.

    Of the other 4 that were finishing the "soft" "conditioning" mode, 1 battery ended with the other 4 that went into the TK70, but 3 just kept on taking charge from the charger, blinking with the 3 capacitiy indicators on full. After over an hour and a half of continuous blinking, after the last of the other 5 batteries finished, I just took them off the charger. Is that OK? My assumption was that these 3 are crap cells and the charger is having a difficult time distinguishing their final capacity which is why the charger keeps trying to feed them charge till done.

    I tested the TK70 in the tub in cool water. The head and heatsink were just a tad warm even under the cool water at 1 hour 2 minutes. But not hot at all.

  4. #124
    Flashaholic*
    Join Date
    Nov 2009
    Location
    Chesapeake, VA
    Posts
    646

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by CyberCT View Post
    You know, I'm thinking about the LION option. If the TK70 steps down from turbo to high when only 3.8v is available from the batteries, wouldn't a LION step down too soon? If you charge 2 LION 32600 cells to say 4.2v and then use them in the TK70 the TK70 would step down when the LIONs are only what, 70% capacity remaining? Because LION cells are rated at 3.7v.
    Voltage in series is additive. Lithiums shouldn't be drained below 3v so even drained they would still have 6v not counting for voltage sag.

  5. #125
    Flashaholic*
    Join Date
    Nov 2009
    Location
    Chesapeake, VA
    Posts
    646

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by CyberCT View Post
    Did a runtime test of 4 of 8 Tenergys fresh off "soft" "condition" mode from my Maha 808S charger. 1 hour 2 minutes till the light stepped down from turbo to high. You can hear the driver in the light at the end squealing. It sounded like a dive bomb and then went silent haha.

    Of the other 4 that were finishing the "soft" "conditioning" mode, 1 battery ended with the other 4 that went into the TK70, but 3 just kept on taking charge from the charger, blinking with the 3 capacitiy indicators on full. After over an hour and a half of continuous blinking, after the last of the other 5 batteries finished, I just took them off the charger. Is that OK? My assumption was that these 3 are crap cells and the charger is having a difficult time distinguishing their final capacity which is why the charger keeps trying to feed them charge till done.

    I tested the TK70 in the tub in cool water. The head and heatsink were just a tad warm even under the cool water at 1 hour 2 minutes. But not hot at all.
    Actually they were probably your better quality cells as far as capacity is concerned. The first one off conditioning on my Maha 808 is the cell that tested lowest in capacity. The cells that could go over 8000mah took much longer. The reason for this is they take longer to charge and discharge. So contrary to what you thought those are probably your highest capacity cells.

  6. #126

    Default Re: Best rechargeable "D" cell

    357mag1, please help me understand. So two LION cells at full charge each are 4.2v x 2 = 8.4v. So nominal LION cell voltage is 3.7v x 2 = 7.4v. If each cell was discharged to 3v each (the safe minimum), that's 3v x 2 = 6v. With no battery protection, the TK70 driver would not step down from turbo to high until just 3.8v was available. So it would drain the LION cells down to 1.9v each x 2 = 3.8v.

  7. #127
    Flashaholic*
    Join Date
    Nov 2009
    Location
    Chesapeake, VA
    Posts
    646

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by CyberCT View Post
    357mag1, please help me understand. So two LION cells at full charge each are 4.2v x 2 = 8.4v. So nominal LION cell voltage is 3.7v x 2 = 7.4v. If each cell was discharged to 3v each (the safe minimum), that's 3v x 2 = 6v. With no battery protection, the TK70 driver would not step down from turbo to high until just 3.8v was available. So it would drain the LION cells down to 1.9v each x 2 = 3.8v.
    You are correct, if the batteries are not protected it would drain them too low. Once you do that a Lithium cell is questionable at best and can be quite dangerous. In this respect Nimh chemistry is much safer and more rugged.

  8. #128

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by 357mag1 View Post
    Actually they were probably your better quality cells as far as capacity is concerned. The first one off conditioning on my Maha 808 is the cell that tested lowest in capacity. The cells that could go over 8000mah took much longer. The reason for this is they take longer to charge and discharge. So contrary to what you thought those are probably your highest capacity cells.
    I think you are correct. That second batch of batteries, the 3 that I took off the charger charging 1.5 hours longer, 1 that finished previously with the rest, lasted 1 hour 10 minutes on turbo in my light. That's pretty darn good! I thought I read somewhere that the TK50 battery tube fits on the TK70 tube. I'll have to confirm it but if so and I can find a distributor that sells the tube only then I'll spring for it. If I can get more runtime with the light and with less squealing at the end of turbo mode (which would scare the fish away maybe?) then I think that's ideal.

  9. #129
    Flashaholic*
    Join Date
    Nov 2009
    Location
    Chesapeake, VA
    Posts
    646

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by CyberCT View Post
    I think you are correct. That second batch of batteries, the 3 that I took off the charger charging 1.5 hours longer, 1 that finished previously with the rest, lasted 1 hour 10 minutes on turbo in my light. That's pretty darn good! I thought I read somewhere that the TK50 battery tube fits on the TK70 tube. I'll have to confirm it but if so and I can find a distributor that sells the tube only then I'll spring for it. If I can get more runtime with the light and with less squealing at the end of turbo mode (which would scare the fish away maybe?) then I think that's ideal.
    The AccuEvolution cells which test out between 8500 -8900mah struggle to reach 60 minutes. That higher voltage under load makes a difference, the TK70 on Turbo draws over 1amp more from the AccuEvolution cells due to voltage sag which depletes the cell quicker.

    I just tried it and the TK50 battery tube fits. I added the spacer and used 3 D cells to make sure it made proper electrical contact and it does. The TK70 spacer doesn't seat into the TK50 tube deep enough for the O-ring to seal. This applies to the TK70 tailcap as well. The O-ring is still exposed when it is screwed down tight on the TK50 tube. You would need a TK50 tailcap as well or someone to modify the TK70 cap length to fit. Problem is once modified the TK70 tailcap wouldn't make contact on the TK70 tubes.

    I'm assuming you intend to use Lithium-Ion cells. Remember two of them are about .8inches longer than two Nimh D cells. You have about an inch of spring to work with in the TK50 tailcap so it could be done. It would be an unbalanced light though, very head heavy and tend to want to tip toward the head unless you placed your hand around the switches.

    Not trying to dampen your enthusiasm just bringing to light any potential issues I can foresee. You might as well buy the TK50 outright, it is a great little light.

  10. #130
    Flashaholic* hank's Avatar
    Join Date
    Apr 2001
    Location
    Berkeley CA
    Posts
    1,526

    Default Re: Best rechargeable "D" cell

    On conditioning -- I have a Maha C9000 (the AA-size charger).
    It has a 2.0A power supply.

    I can extend the contacts with clips and wires and magnets to handle these Tenergy D cells.

    How do I set it up to condition/break in these cells -- how many can it handle at what charge/discharge settings?

  11. #131
    Flashaholic* hank's Avatar
    Join Date
    Apr 2001
    Location
    Berkeley CA
    Posts
    1,526

    Default Re: Best rechargeable "D" cell

    On conditioning -- I have a Maha C9000 (the AA-size charger).
    It has a 2.0A power supply.

    I can extend the contacts with clips and wires and magnets to handle these Tenergy D cells.

    How do I set it up to condition/break in these cells -- how many can it handle at what charge/discharge settings?

  12. #132

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by 357mag1 View Post
    The AccuEvolution cells which test out between 8500 -8900mah struggle to reach 60 minutes. That higher voltage under load makes a difference, the TK70 on Turbo draws over 1amp more from the AccuEvolution cells due to voltage sag which depletes the cell quicker.

    I just tried it and the TK50 battery tube fits. I added the spacer and used 3 D cells to make sure it made proper electrical contact and it does. The TK70 spacer doesn't seat into the TK50 tube deep enough for the O-ring to seal. This applies to the TK70 tailcap as well. The O-ring is still exposed when it is screwed down tight on the TK50 tube. You would need a TK50 tailcap as well or someone to modify the TK70 cap length to fit. Problem is once modified the TK70 tailcap wouldn't make contact on the TK70 tubes.

    I'm assuming you intend to use Lithium-Ion cells. Remember two of them are about .8inches longer than two Nimh D cells. You have about an inch of spring to work with in the TK50 tailcap so it could be done. It would be an unbalanced light though, very head heavy and tend to want to tip toward the head unless you placed your hand around the switches.

    Not trying to dampen your enthusiasm just bringing to light any potential issues I can foresee. You might as well buy the TK50 outright, it is a great little light.
    Hmm I need the waterproofness and that's too much modding so I'll stick with the stock tubes. I have a bunch of those 2AA to D cell adapters which have plastic bodies. I would simply cut one in half and then cut it down further, solder 16 gauge copper wire on the inside, and electrical tape it shut. That way I shouldn't have to cut the tailspring and have a perfect "dummy" cell.

    I would put the dummy cell as the 1st cell in the 3D tube, so the weight of the LION batteries would be on the handle end helping to balance out the light a bit. My problem is how the heck to LION cells even work then with this light? Unprotected cells will be overdischarged so they don't work. The Novae which are the only protected LION 32650 cells I know of tha tare supposd to be quality, don't work either because their protection circuit kicks in. So what LION cells do I use??

  13. #133

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by hank View Post
    On conditioning -- I have a Maha C9000 (the AA-size charger).
    It has a 2.0A power supply.

    I can extend the contacts with clips and wires and magnets to handle these Tenergy D cells.

    How do I set it up to condition/break in these cells -- how many can it handle at what charge/discharge settings?
    Although they have not arrived in the mail yet, I bought a set of those AAA to AA adapters. I bought a wooden dowel at Home Depot for $1. I will solder 20 gage solid copper wire (plastic sheath like all wire, but the copper is not braided) to the inside postiive and negative ends of the AAA AA adapters. Then I will cut the wooden dowel down to the size of an AAA battery and put it in the adapters to keep tension on soldered ends from being yanked out. I also bought those 2D cell series adapters in Radioshack for $2 each. I will wire them up as individual cells to each AAA AA adapter to put in the C9000.

  14. #134
    Flashaholic* hank's Avatar
    Join Date
    Apr 2001
    Location
    Berkeley CA
    Posts
    1,526

    Default Re: Best rechargeable "D" cell

    Sounds good; I was thinking of using alligator clips but the plastic-adapter-and-dowel sounds like a better electrical contact.
    I'll get the same stuff and follow along behind. Do you have a notion if you can condition more than one of these D cells at a time, given the 2.0A power supply?

  15. #135
    Flashaholic*
    Join Date
    Nov 2009
    Location
    Chesapeake, VA
    Posts
    646

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by CyberCT View Post
    Although they have not arrived in the mail yet, I bought a set of those AAA to AA adapters. I bought a wooden dowel at Home Depot for $1. I will solder 20 gage solid copper wire (plastic sheath like all wire, but the copper is not braided) to the inside postiive and negative ends of the AAA AA adapters. Then I will cut the wooden dowel down to the size of an AAA battery and put it in the adapters to keep tension on soldered ends from being yanked out. I also bought those 2D cell series adapters in Radioshack for $2 each. I will wire them up as individual cells to each AAA AA adapter to put in the C9000.
    For a spacer I've used copper pipe with a cap on the end the spring pushes on. You could cap both ends I just let the pipe push against the negative end of the battery. Then I used PVC pipe for a sleeve and the copper pipe fit inside of it. You could use aluminum rod and just wrap it with tape to take up the slack inside the PVC pipe.

    When performing the test for you on the TK70 I just used a bolt inside PVC with a coin shaped rare earth magnet to get the proper spacing. It wasn't fancy but is solid and quick.

    I just tried a runtime with the Novae batteries and the light went dead at 4min 12sec so they difinitely wouldn't do you any good.

  16. #136

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by hank View Post
    Sounds good; I was thinking of using alligator clips but the plastic-adapter-and-dowel sounds like a better electrical contact.
    I'll get the same stuff and follow along behind. Do you have a notion if you can condition more than one of these D cells at a time, given the 2.0A power supply?
    My only plan for using the C9000 with my D cells was to do a discharge at 1 amp per cell. 1 amp is the max discharge rate the C9000 will allow. Since I'm essentially discharging batteries wouldn't that use very little power from the outlet? I didn't know the power supply draws a max of 2amps from the outlet. That doesn't make sense though because if you just charge four AA batteries at 1 amp each, that's 4 amps.

  17. #137
    Flashaholic*
    Join Date
    Nov 2009
    Location
    Chesapeake, VA
    Posts
    646

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by CyberCT View Post
    My only plan for using the C9000 with my D cells was to do a discharge at 1 amp per cell. 1 amp is the max discharge rate the C9000 will allow. Since I'm essentially discharging batteries wouldn't that use very little power from the outlet? I didn't know the power supply draws a max of 2amps from the outlet. That doesn't make sense though because if you just charge four AA batteries at 1 amp each, that's 4 amps.
    The C9000 can actually put out 2amps to all 4 cells for a total of 8amps. Multiply 8x1.5volts and you achieve power in watts. In this case 12watts consumed to provide 2amps to all 4 cells. The power supply (wall unit) for the C9000 provides 12v x 2amps for a total of 24watts. Since nothing is perfect the unit may draw 15-16 watts from the wall to power all 4 channels at 2amps.

    You are correct that during discharge very little is needed from the power supply. The main limitation is getting rid of the heat as that power from the cell has to go somewhere.

  18. #138

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by drmalenko View Post
    This is a super deal and super hard to pass up.. he has 81 of them left (show 81 sets of 8)... He also has another auction with 4 for 15.00 in case you dont need 8

    Also posting in the good deals section

    http://www.ebay.com/itm/360432953035...84.m1423.l2649

    If this isnt allowed I apologize in advance and please remove the link
    I've done OK with those blue ones from that vendor. Out of the plastic they are really low at .87 to .94, mine have charged up so far. I'm putting them in my lanterns, mag lites and my tent fan. It sure helps the wallet at half the price of my Tenergy Premiums.

  19. #139

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by Sagebrush View Post
    I've done OK with those blue ones from that vendor. Out of the plastic they are really low at .87 to .94, mine have charged up so far. I'm putting them in my lanterns, mag lites and my tent fan. It sure helps the wallet at half the price of my Tenergy Premiums.
    Yea I figure for $50 for 16 cells it's not too bad, even if there are crappy performers there. I have two XML modified Rayovac Sportsman Xtreme lanterns, each takes 3 D cells. So that's 6 of 16. So even if my worst D cells are 7,000 mah that's still enough runtime on high for the whole night. Then I'd save my best performing Tenergys for the TK70 if I were to use it. Which is 4 of 16. What tent fan do you have? I have seen them and was thinking about buying a small but good D cell one, powered by at most 6 D cells which is what I have remaining.

  20. #140

    Default Re: Best rechargeable "D" cell

    I am having a bit of an issue with the Tenergy Blue D Cells from that ebay seller. My cells also arrived with a very low voltage. all were in the .9 range. When i charge them via the Maha 9000 the cells will never get to 1.47 volts for them to terminate. The voltage just stays at 1.41 and never goes up. I put 12,000mAh into them and it never went past 1.41 volts. They also never got hot.
    After the Maha, i i put the cells on my hobby charger and they terminate right away when the peak delta is set to 5mV. They only discharge to about 7,000mAh. I'll try to exercise them and see if they open up. Anyone else seen this?

    Thanks,
    JD

  21. #141

    Default

    I use a 4 d fan from academy. I thinks its a timber creek . It will go two nights . Its the yellow and black one with the led lights.

    My blue tenergies shut off at 1.40 using the tenergy charger. Same with the premium ones . Its probably the 7.5 hour timer.

    Sent from my GT-S5690L using Tapatalk

  22. #142

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by JudasD View Post
    I am having a bit of an issue with the Tenergy Blue D Cells from that ebay seller. My cells also arrived with a very low voltage. all were in the .9 range. When i charge them via the Maha 9000 the cells will never get to 1.47 volts for them to terminate. The voltage just stays at 1.41 and never goes up. I put 12,000mAh into them and it never went past 1.41 volts. They also never got hot.
    After the Maha, i i put the cells on my hobby charger and they terminate right away when the peak delta is set to 5mV. They only discharge to about 7,000mAh. I'll try to exercise them and see if they open up. Anyone else seen this?

    Thanks,
    JD
    How did you charge them on the Maha C9000? My initial plan was just a discharge per cell at 1 amp on the C9000 to get the capacity per cell. Charging them is done on my Maha 808D. Also, I used a volt meter for each cell off my 808D and none of them were 1.5v. They were in the 1.4v range. But that's normal, my eneloops come off in the 1.4v range too.

  23. #143

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by CyberCT View Post
    How did you charge them on the Maha C9000? My initial plan was just a discharge per cell at 1 amp on the C9000 to get the capacity per cell. Charging them is done on my Maha 808D. Also, I used a volt meter for each cell off my 808D and none of them were 1.5v. They were in the 1.4v range. But that's normal, my eneloops come off in the 1.4v range too.
    I don't have any fancy chargers and my D cells just came off the V-9688 at 1.42 to 1.40. After three hours they are reading 1.35. Thats the first charge on new blue D cells. This batch of 4 were all .88 out of the box.

    I didn't know that they could reach 1.5? My Premiums stay 1.35 to 1.38 after sitting a day or so. Is that right?

  24. #144

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by CyberCT View Post
    How did you charge them on the Maha C9000? My initial plan was just a discharge per cell at 1 amp on the C9000 to get the capacity per cell. Charging them is done on my Maha 808D. Also, I used a volt meter for each cell off my 808D and none of them were 1.5v. They were in the 1.4v range. But that's normal, my eneloops come off in the 1.4v range too.
    I just have dummy cells that have wire outputs that then go from the maha 900 to a cradle for my cells. I charged them at 2A. The maha 9000 terminates at 1.47v. This is the voltage that is read DURING charge. I have Tenergy Premium and Centura D that will both terminate at 1.47 on the maha. Right after charge they will read high 1.3x or low 1.4x. These blue Tenergy will just sit at 1.41 and keep taking charge current. they never got hotter and the volts never go any higher. They must have a very high internal resistance. Maybe from sitting on the shelf for a very long time in a discharged state?

    JD

  25. #145
    Flashaholic* Russel's Avatar
    Join Date
    Jan 2009
    Location
    California
    Posts
    583

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by JudasD View Post
    I just have dummy cells that have wire outputs that then go from the maha 900 to a cradle for my cells. I charged them at 2A. The maha 9000 terminates at 1.47v. [...]
    Remember that unless you have one of the older MH-C9000 chargers, there is a limit of about 4500mAh (if I remember the number correctly) in every [edit] Charge [end edit] mode except break-in. Break-in mode has a limit of 20000mAh, if I remember correctly. Of course, you can always run a second charge cycle to completely charge 5000mAh to 10000mAh D cells.
    Last edited by Russel; 03-04-2012 at 11:12 AM. Reason: Clarification

  26. #146

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by Russel View Post
    Remember that unless you have one of the older MH-C9000 chargers, there is a limit of about 4500mAh (if I remember the number correctly) in every mode except break-in. Break-in mode has a limit of 20000mAh, if I remember correctly. Of course, you can always run a second charge cycle to completely charge 5000mAh to 10000mAh D cells.
    Yes, i have one of the newer ones. I have to run multiple charge cycles back-to-back. So far i have run 3 cycles and it will never terminate and just stays at 1.41 volts. On my Tenergy D Premiums, which are also 10,000mAh, the charger usually terminates in the middle-ish of the 3rd cycle when it hits 1.47 volts.

    JD

  27. #147

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by Russel View Post
    Remember that unless you have one of the older MH-C9000 chargers, there is a limit of about 4500mAh (if I remember the number correctly) in every mode except break-in. Break-in mode has a limit of 20000mAh, if I remember correctly. Of course, you can always run a second charge cycle to completely charge 5000mAh to 10000mAh D cells.
    Wait, so the C9000 will not discharge my blue Tenergy D cells completely, if I do a discahrge mode? My initial intention was to do a discharge at 1 amp for all my Tenergys and see their capacity. I don't want to run 2 discharge mode cycles.

  28. #148

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by CyberCT View Post
    Wait, so the C9000 will not discharge my blue Tenergy D cells completely, if I do a discahrge mode? My initial intention was to do a discharge at 1 amp for all my Tenergys and see their capacity. I don't want to run 2 discharge mode cycles.
    It will discharge them completely. It is the charge cycle that is limited to 4,000mAh per channel. So you will have to do back-to-back charge cycles until the charger terminates on its own.

    JD

  29. #149

    Default

    Quote Originally Posted by Sagebrush

    I've done OK with those blue ones from that vendor. Out of the plastic they are really low at .87 to .94, mine have charged up so far. I'm putting them in my lanterns, mag lites and my tent fan. It sure helps the wallet at half the price of my Tenergy Premiums.
    All of mine had similar voltage out the plastic. I charged them, then discharged, then charged again. They all seem fine and perform just fine.

    I have several mag lights that I have custom SST-90 builds in and these cells deliver over 10 amps with no trouble...
    Last edited by drmalenko; 02-23-2012 at 12:39 AM.

  30. #150
    Flashaholic*
    Join Date
    Nov 2009
    Location
    Chesapeake, VA
    Posts
    646

    Default Re: Best rechargeable "D" cell

    Quote Originally Posted by CyberCT View Post
    Wait, so the C9000 will not discharge my blue Tenergy D cells completely, if I do a discahrge mode? My initial intention was to do a discharge at 1 amp for all my Tenergys and see their capacity. I don't want to run 2 discharge mode cycles.
    I discharged three of my cells at 1amp to help give you a comparison. Even though there seemed to be no difference doing it at 3amps or 5amps when done at 1amp capacity showed between 600-650ma higher.

    My low capacity cell that was averaging right around 5900mah gave 6506mah. By subtracting 600mah you should have a pretty valid idea of capacity per cell at the load your TK70 pulls.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •