Batteries Series+Parallel

Lycurgus · Post by **Lycurgus** » Wed Feb 22, 2006 6:20 pm

Hey there guys, I wondering if you could do a setup like this picture. It's only temporary until I get some bigger capacity batteries. Would there be any problem in charging them this way? Or how would I charge them this way? They are only 700maH but I have 30+ of them. http://img.photobucket.com/albums/v493/ ... /batts.jpg

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Wed Feb 22, 2006 6:26 pm

im not sure, that is kinda a funky diagram i think it would be easier and better to just use normal AAs temporarorly and deal with the bad life and then buy a rechargable rc pack

Lycurgus · Post by **Lycurgus** » Wed Feb 22, 2006 6:30 pm

They are from a battery pack (low capacity though) the bottom lot are in parallel and the top pack are in series. Is there any weird problems with charging having half in series and half in parallel?

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Wed Feb 22, 2006 6:31 pm

it would be an odd charge i am not sure how exactly you would do it

Lycurgus · Post by **Lycurgus** » Wed Feb 22, 2006 6:38 pm

Neither, hence my question. I suppose I'll just have to put up with using wall power until I can get these batteries. Ever heard of these c/d cell batteries with 10,000maH. Where I'm looking they're $9 each (or something like that) Are these real or not?

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Wed Feb 22, 2006 6:42 pm

never tried em

but id say go for it

Lycurgus · Post by **Lycurgus** » Wed Feb 22, 2006 6:52 pm

The thing is I don't want to buy them and then find out they're a hoax and not 10,000maH I find it quite remarkable that they could hold that much each. heres the c cell 5000maH http://www.trademe.co.nz/structure/0124 ... 526473.htm and the d cell 10,000maH http://www.trademe.co.nz/structure/0005 ... 757395.htm 10,000mah ones are $18 NZ sorry

superdeformed · Post by **superdeformed** » Wed Feb 22, 2006 7:47 pm

If you want to charge one set in series and the other in parallel you would need two seperate chargers/charging circuits. The charging voltage would be different between the two, so if you hooked them all up like that the series set wouldn't go very far. As for those C/D batteries, you should do a bit more research on them before you buy them. Try and find out the current draw that they're rated for and make sure that its enough to power whatever it is you're using them for.

JAY · Post by **JAY** » Wed Feb 22, 2006 8:26 pm

So, you have 7 cells in series, and those in parallel with 8 singles? Isn't that a big no-no? You need the voltages across all of the cells in parallel to be equal. That includes the set in series as well. Otherwise, the batteries in series are going to try to increase the voltage across the singles in parallel, in an attempt to balance out the circuit, meaning that your single cells will be absorbing power. And having 8.4V across a 1.2V battery is definitely not a good thing.

daguuy · Post by **daguuy** » Wed Feb 22, 2006 9:11 pm

since those batteries are only 700mah, putingt 2 in parallel only gives you 1400mah. that's very little capacity and very big and heavy. just get a better battery and don't bother with those

Metroid fan · Post by **Metroid fan** » Wed Feb 22, 2006 10:01 pm

You could buy just one I guess... It would be great for a portable!

akadewboy · Post by **akadewboy** » Wed Feb 22, 2006 11:41 pm

Have you tried looking at some of these batteries?

http://www.batteryspace.com/

I don't know what voltage you need, but there's some nice ones on that site.