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Vrflyer

balancing lithium battery

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I have one lithium battery with the balancing plug, it's a two cell. I have two charger identical, can I use my two charger and charge the two cell individually by using the balancing plug or I must use the balancing circuit.

I have two battery without balancing plug, is it possible to add the balancing plug ?

I read that if we try to add the balancing plug, we can destroy the battery.

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I have two charger identical, can I use my two charger and charge the two cell individually by using the balancing plug...

The nice thing about using a pack balancer is that the entire pack can be charged with extra safety. However, to balance a pack you can charge single cells {within a pack} using the tap plug. You'll have to do it one cell at a time. This is not usually a problem since you only have to do the tap recharge trick when you find that the pack's cells are out of balance (>0.1V difference).

I have two battery without balancing plug, is it possible to add the balancing plug ?

Yes. The attached schematics shows TP's wiring scheme for 2S thru 5S packs. I don't know if the color codes are universal across all their products.

I read that if we try to add the balancing plug, we can destroy the battery.
The cells are delicate and the tabs are usually aluminum that require special solder and soldering techniques.

When handling LiPO's please take extreme caution. Good details are found here (EVERYONE SHOULD READ THIS BEFORE USING LIPOS): http://www.rcgroups.com/forums/showthread.php?t=209187

post-6-1150909398_thumb.jpg

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Dose anyone have a good balancer circuit to share ?

Terry

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Thanks for the links, have you used either of these ?

Terry

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The greatest risk when modifying packs is short-circuiting the cells. Often packs are made of cells soldered on a PCB. Once the tubing/foam is removed the solder pads are bare and close to each other. Be sure to have a clean workplace. Be extremely careful when soldering wires / cells not to touch 2 terminals with the iron, it's very easy to rip a few millimeters. Molten solder can also drip to the neighboring pad!

Regarding the first question, do not charge cells at the same time with 2 chargers, do it one cell at a time like Mr.RC-CAM said. Especially if the chargers are running off 12V, they are likely to have a common ground between input and output. You might then short a cell if it's the case.

Lipos are very good and don't cause problems when used properly. I've already made/modified packs, restored cells that have been discharged to 0V and so on. But with them, DIY is indeed NOT to be considered if you're not 100% sure of what you do.

I've also done my little series of tests ;)

http://www.rc-tech.ch/divers/accu.wmv

http://i18.photobucket.com/albums/b105/Kil.../P1060415_t.jpg

http://i18.photobucket.com/albums/b105/Kil.../P1060414_t.jpg

http://i18.photobucket.com/albums/b105/Kil.../P1060516_t.jpg

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