remaking battery pack

ernest2 · Jun 7, 2006

hi! i have asked about this in other forum with less success.

i have 2 IB 6-cell matched packs and 1 IB 6cell loose pack. these are used packs, charges about 3700-3800mah. now i want to build a 7cell pack, since my esc (futaba mc330) can only support 7cells.

now i am thinking of getting a single cell from the loose pack and solder it to matched pack to make a 7cell.

my question will be is it ok to mix matched and loosed cells? and are there anything i should be concerned of?

thank you and any comments and suggestions are appreciated.

thanks a lot

ernest

jayt · Jun 8, 2006

As long as the cells are the same kind (all IB3800s, etc.) you can do this. (If the cells are different types, the do not do this.) The new 7-cell pack may no longer be well matched, but for sport running you can certainly live with that.

Before you first fully charge the new 7-cell pack, balance it. Put it on the charger at about 1/2 amp and charge until it peaks. This will insure that all cells are fully charged; otherwise you can overheat a cell when charging the pack at a higher ampre rate. Then use the pack as you normally would.

.

ernest2 · Jun 14, 2006

well i can't disconnect one cell from the pack, maybe i didnt use the correct solder rod, and i don't know the wattage of the solder either (its an old one.). i guess i'll just use hack saw or dremel and cut the battery connector.

another question, can i use banana plug type connector used in electrical connections? i found pack of 6 in a electrical store and thought its similar to ones used by car racers. has anyone tried it>? is it better than tamiya bullet connector?

jayt · Jun 14, 2006

You'll have to solve your soldering problem before you can re-build a pack. If you cut a cell off one pack, how will you ever connect it to the other 6-cell pack? You want to use a 40W minimum soldering iron with a wedge or chisel tip. A soldering gun or a small round tip won't do it.

I can't comment on the "banana" connectors you found without more details - all banana plugs are used in electrical conections. Some of these are of poor quality and will cause a lot of problems. If you want to do it right get some Deans connectors from an on-line R/C car or boat vendor. For low wattage use the Tamiya connectors work, but they are far from ideal.

.

Old Sloppy · Jun 15, 2006

jayt said:
If you want to do it right get some Deans connectors from an on-line R/C car or boat vendor.

Lets hear it for Jay...

Deans connectors, do it right.

Harry S.

ernest2 · Jun 15, 2006

these are the pics of my battery and the connector i use. i bought this battery used from a car guy. i havent bought deans yet, but i will.

the bars that connect batteries is the one i meant to cut, and then solder wire to connect it to the pack.

thanks!!

remaking battery pack

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remaking battery pack

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