Quote:
|
Originally Posted by sanddrag
I don't think you're going to get that kind of capacity outof NiMH or NiCd unless you go in parallel with a bridge rectifier setup. I don't know that much about putting NiCds or NiMHs in parallel. About the NiMH batteries themselves, the most common form is Sub-C size cells with 1.2V each and up to 3800mAh of capacity each. You can buy them preassembled in series in packs for higher voltage. But then you'd want multiple packs in parallel for more capacity. However, I remember hearing that if a bridge rectifier is not used, the current will flow back and forth between the two until they discharge themselves.
|
I don't know much about bridge rectifiers, but I know that putting NiMH or NiCD cells in series can be done. I saw some large packs of batteries somewhere online, I don't remember where, but I remember that they have been used for Battlebot type robots. I also stopped by my LHS to pick up some stuff, and they had large NiMH battery packs that were about 30 or so NiMH cells in 3 series of 10 batteries. It was about 12V at 10Ah, a little smaller than the average batteries we use in FIRST, but it was also very expensive. I'm sure they make chargers for a 12V NiMH pack, but charging it would take a long time because of it's Ah..that is if you want to keep the batteries in the best condition possible for a longer life...And discharging would take quite a while.
Using a SLA battery would be a better choice, less maintenance and plus, you don't really have to discharge them to store them like you would a NiMH pack.