Help incan-Noob with first mag mod...

[kramer5150]

Sorry if this seems a bit redundant... I tried searching through all the 1000s of ROP threads and was not able to find the info I was looking for.

I found these 26700 cells and would like to use two of them in an ROP build
http://www.voltmanbatteries.com/servlet/the-3365/26650-BATTERY-REPLACES-A123/Detail

Can these cells handle the discharge rate of an ROP Hi and Lo?
Can the ROP PR bulbs handle the 8.4V total?
Can a MAG 6-cell PR bulb handle the 8.4V total?

What is the best mag host for this project?
Should I use a 3C host and DIY a spacer to bridge the extra space? or would I be better off with the larger sized 3D + DIY spacer tube, in an effort to try and keep the cells cool/isolated from the heat of the lamp?



thanks!!

 

[moviles]

http://www.voltmanbatteries.com/serv...ES-A123/Detail

45 amp max, 3.7v 3a/h....... its safe chemistry?

and this other ??????

http://www.molicel.com/ca/pdf/IMR26700.pdf

40 amp 3.7v 2,9a/h... its safe chemistry like the aw imr batteries ????

 

[Fulgeo]

Sorry if this seems a bit redundant... I tried searching through all the 1000s of ROP threads and was not able to find the info I was looking for.

I found these 26700 cells and would like to use two of them in an ROP build
http://www.voltmanbatteries.com/servlet/the-3365/26650-BATTERY-REPLACES-A123/Detail

Can these cells handle the discharge rate of an ROP Hi and Lo?
Can the ROP PR bulbs handle the 8.4V total?
Can a MAG 6-cell PR bulb handle the 8.4V total?

What is the best mag host for this project?
Should I use a 3C host and DIY a spacer to bridge the extra space? or would I be better off with the larger sized 3D + DIY spacer tube, in an effort to try and keep the cells cool/isolated from the heat of the lamp?



thanks!!

The ROP 3854 H and L bulbs should both be able to handle 2 fresh off the charger 3.7 lithium-ion cells. Now in that link they say "same battery used in 36 volt Dewalt lithium batteries, and the 28 volt Milwaukee batteries". This is wrong since the Dewalt pack uses 3.3 volts A123 cells and the Milwaukee uses the original Emoli 3.7 volt cells. Let assume they mean the same type of battery as Emoli 3.7 volt cells. So that would be 4.0-4.2 volts hot off the charger. If this is true it will work well with the ROP 3854 H/L bulbs. For the host your best bet is a 2D Mag not a 3D Mag. Use some schedule 40 PVC pipe to make a sleeve to hold your 2 lithium cells. I like the gray electrical conduit type but the water pipe type is fine also. Just take a cell with you to the hardware store before you buy some to make sure it can fit the cell inside. They will fit nice and snug and will fit in the 2D Mag well. You will have to do a tail cap mod. De-anodize the inside bottom of the cap with lye drain cleaner, about a quarter inch of cleaner in the bottom works great. You can also sand it off. Now cut a small washer of car heater hose to fit in the bottom of the tail cap about 3/8" thick. Wrap this rubber washer with some copper de-soldering braid and you have your low profile spring. You should not have to worry about isolating the cells from the heat of the lamp. There are other ways of doing this mod but this is the simplest and most reliable IMO.
Happy Mods!

 

[kramer5150]

The ROP 3854 H and L bulbs should both be able to handle 2 fresh off the charger 3.7 lithium-ion cells. Now in that link they say "same battery used in 36 volt Dewalt lithium batteries, and the 28 volt Milwaukee batteries". This is wrong since the Dewalt pack uses 3.3 volts A123 cells and the Milwaukee uses the original Emoli 3.7 volt cells. Let assume they mean the same type of battery as Emoli 3.7 volt cells. So that would be 4.0-4.2 volts hot off the charger. If this is true it will work well with the ROP 3854 H/L bulbs. For the host your best bet is a 2D Mag not a 3D Mag. Use some schedule 40 PVC pipe to make a sleeve to hold your 2 lithium cells. I like the gray electrical conduit type but the water pipe type is fine also. Just take a cell with you to the hardware store before you buy some to make sure it can fit the cell inside. They will fit nice and snug and will fit in the 2D Mag well. You will have to do a tail cap mod. De-anodize the inside bottom of the cap with lye drain cleaner, about a quarter inch of cleaner in the bottom works great. You can also sand it off. Now cut a small washer of car heater hose to fit in the bottom of the tail cap about 3/8" thick. Wrap this rubber washer with some copper de-soldering braid and you have your low profile spring. You should not have to worry about isolating the cells from the heat of the lamp. There are other ways of doing this mod but this is the simplest and most reliable IMO.
Happy Mods!

Great thanks for that feedback. I might just end up getting both mag hosts and see which I like best. I generally prefer smaller diameter lights because I find them a little easier to hold/grasp. Plus I am thinking I can store the extra ROP bulb in the tailcap.

decisions...

 

[Fulgeo]

Great thanks for that feedback. I might just end up getting both mag hosts and see which I like best. I generally prefer smaller diameter lights because I find them a little easier to hold/grasp. Plus I am thinking I can store the extra ROP bulb in the tailcap.

decisions...

If you like the C size Mags realize to use the 26700 cells you are going to have to bore out your Mag to fit the diameter of the cells. If you do not want to bore out your Mag C you will have to go with 18650 cells which typically have less capacity, although AW is selling some nice ones.

 

[kramer5150]

oops... nm.
Thanks all for the replies!!

 

[moviles]

If you like the C size Mags realize to use the 26700 cells you are going to have to bore out your Mag to fit the diameter of the cells. If you do not want to bore out your Mag C you will have to go with 18650 cells which typically have less capacity, although AW is selling some nice ones.

but the max recomended curent draw of the aw 18650 its only 16 amp

 

[Fulgeo]

but the max recomended curent draw of the aw 18650 its only 16 amp

Not sure I am following you. Are you talking about capacity ( mAh ) i.e. the electric charge transferred by a steady current of one ampere for one hour or the ampere or amp which is a measure of the amount of electric charge passing a point per unit time. I will assume you mean amp since you mentioned "16 amp" and "draw" specifically. If the cell can handle a 16 amp draw it should not be an issue since the ROP HI bulb he mentioned is under 5 amps at 8.0 volts. Enlighten me Moviles because I am unclear what you are trying to point out.