Hey all...

I want a 4 cell battery and have heaps of 3300mAh 6 cell batteries that i no longer use... if the cells are ok, it should be ok to pull them apart and make my own packs up?

My real question is..

if they are 3300mAh, does that mean that each cell is 3300 or is it a total of all 6 cells added together? I think it is the first.. but thought i would check.

Any dangers or tips for carrying this out?

Cheers

Never done it but it could be done. You would have to unwrap everything and resolder the connections on the most likley aluminum tabs. Should only have to desolder the 2 you are removing as they are wired in series for the most part. You would also have to replace the 6s balancing connector with a 4s. The mAh rating is the same on each cell so you would end up with a 4s 3300 mAh pack.

Personally I wouldnt attempt it as its not worth the risk to me. One goof like slipping with the soldering iron and piercing one of the cells and it could blow up in your face. Even the soldering technique has to be spot on as if you get the connector too hot it could cause the same result as above....POOF!

He is talking the good old C-cell batteries I believe. Not a Lipo. Yes each cell is 3300 mah. Yes you can re-build them with not problem. If they are a pre-made stick pack they can be difficult to get apart but if they are packs you did yourself then it shouldn't be any trouble at all.

Let's assume you are talking about sub-C cells, the capacity is for each cell. Each cell is therefore 1.2 volts / 3300maH. you get 7.2 volts from 6 x 1.2v cells. The capacity does not multiply. If you are stripping an old stick pack, dont cut the output leads together, you will create a short through your wire cutters (seen this done!), cut each wire seperatly. If you are making a side by side 4-cell pack, careful pulling the cells apart, the bars used to join cells in some packs are very thin and razor sharp. If you are making a 4-cell in a stick pack shape, just take the end two cells off and join with a battery bar, strip of brass or similiar.

yes talking old school c-cells

i have carried out the 4 cell mod and worked a treat

going into a bolink Legend

cheers for the input...

when charging i got 4400 mha in at nearly 6V with the 4 cells from a 4600mha 7.2V stick

Just take note that the charge voltage will always be higher than the voltage either at rest or under load. The nominal voltage at rest will be closer to 4.8v, and even less under load, say around 3.6v, even less for older or abused cells.