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  1. SilverFox

    SOLVED: Maha Powerex MH-C9000 fails start test!

    Hello Schermann, One thing you can try is to reach out to MAHA and see if they can help. Tom
  2. SilverFox

    Advice for accessing the bulb without damage? Classic Yellow Plastic 2xD battery

    Hello j202, Welcome to CPF. I see a spare bulb in there. It looks like you can work it loose and get it out and replace it without total disassembly. If the problem is the bulb, this will fix it. However, if the problem is a connection, you will have to pull the rest out. If you have a...
  3. SilverFox

    Question on Smartphone Battery Charging Technique

    Hello TheMafioso, Welcome to CPF. I ran a quick check and it looks like the ice pack may drop the temperature to somewhere around 3C. That is still a decent temperature to charge at so I don't think there will be any electrical issues. I am not sure how thermal cycling will effect the...
  4. SilverFox

    Charger Inquiry...

    Hello Espresso Junky, Welcome to CPF. The MC3000 will do a great job with your Eneloop cells as well as your 18650 cells. Tom
  5. SilverFox

    18650's Care and Maintenance

    Hello Albert, Each cell manufacturer and sometimes each batch of cells can vary in capacity. The labeled capacity on the cell is often "optimistic." This means that if you want accurate information you end up having to do some cell testing yourself. HKJ has done a lot of testing and posts...
  6. SilverFox

    18650 Suggestions - Help! I’m Very Confused!

    Hello Josh, Welcome to CPF. Research will give you specifications on the performance of many cells. You can search for tests run by HKJ and visit his web page for more information on specific cells. Protected versus unprotected depends upon how much effort you want to put in and how much...
  7. SilverFox

    battery abuse anonymous

    Hello Chillinn, Sometimes good things happen... sometimes not so good things happen. Take care and don't let it get you down. Please note the batteries comment in my signature line... Tom
  8. SilverFox

    Proper battery storage cr123a, 18650

    Hello Esquire, Welcome to CPF. I use waterproof match cases. You have to check their dimensions but they can usually hold 2 CR123 cells stacked. If you need more cells you can check out the Pelican cases. You may need to add some foam to keep the cells from bouncing around but they are very...
  9. SilverFox

    Eneloop Charger

    Hello Firememc, Welcome to CPF. Eneloop cells in general work very well. Your charger may do some damage to the cells if you leave the cells on the charger for extended periods of time. With Eneloop cells you charge them, then remove them from the charger. Tom
  10. SilverFox

    ZTS mini MBT

    Hello KP, Overall I have and use a ZTS tester and it seems to work well. In the special case of CR123A cells I don't trust the initial test but will test a few times to see if I get the same results. Sometimes the initial test will be low, but subsequent tests will give a more realistic idea...
  11. SilverFox

    LADDA 2450 C Rating / Value?

    Hello D-an-W, If your hands are "calloused" from normal keyboard use, too hot is too hot to handle. If you work with your hands you will have to adjust accordingly. Tom
  12. SilverFox

    LADDA 2450 C Rating / Value?

    Hello D-an-W, Batteries get very hot when the charging termination is missed. Pay attention and put your finger on the batteries near the end of the charge. The voltage at termination is usually related to the internal resistance of the battery. Tom
  13. SilverFox

    LADDA 2450 C Rating / Value?

    Hello D-an-W, In theory you are correct. However... Most of the time the label on the battery is optimistic. If you figure 90% of the labeled value you may have a more realistic value to work with. This would put your 2450 at (2450*0.90=2205) 2205 with half that at about 1100. Charging...
  14. SilverFox

    Reconditioning Pb, losing track of MgSO4 -- or it worked *too* well???

    In my area motorcycle riding is a summer pastime. At the end of summer the bike is wedged into a corner of the garage and forgotten about until summer comes around. I have had good luck putting a little epsom salt into the cells of a really dead battery, charging it overnight, and then using...
  15. SilverFox

    Reconditioning Pb, losing track of MgSO4 -- or it worked *too* well???

    Hello Slinkygn, I was looking for that thread and am glad you found it. I should add that my efforts involved recovering larger batteries that were relatively new and were in boats that sunk. This may have played a part in the success I experienced. Tom
  16. SilverFox

    Best technique to keep a second car battery charged onboard ?

    Here is another option but it seems to be a little more expensive. Tom
  17. SilverFox

    Using Li-ion cells in LED flashlights safely

    Hello Xevious, If the cells are closely matched you can get away with charging in series without balancing for awhile. One way to deal with this is to make it a practice of charging the R-CR123 cells externally in a charger and just know that if you need to charge inside the flashlight you...
  18. SilverFox

    What would be cheapest, but safe way to charger number of Li-Ion in series

    Hello Junglemike, The solution is simple... limit your gifts to those who have chargers like yours. :) The problem with a series battery pack is keeping the cells balanced. Balancing chargers tend to cost more. In addition there is the safety information needed to use these battery packs...
  19. SilverFox

    Reviving old NiMH cells using science?

    Hello LMF5000, Sorry, no. I just recycle them and replace them. Tom
  20. SilverFox

    Reviving old NiMH cells using science?

    Hello LMF5000, In my limited amount of investigation on this it seems to me that the usual cause is a drying out of electrolyte in the cell. I like the suggestion of opening up the cell and pouring more electrolyte in. In my case that is unpractical, but it seems to be a good idea. My usual...