I've bought my young son a couple of remote control tanks for Christmas. They are supplied with two rechargeable 'battery packs' (4 x AA batteries heat shrunk together). The battery pack supplied is Ni-Cd 400mAh 4.8V
The charger says "Output 4.8VDC 250mA".
The reviews of these tanks say they are great but the batteries don't last very long.
I wondered if I could buy 4 x 2850mAH AA batteries and then solder them together to replicate the supplied battery pack and then charge them with the supplied charger and use these instead of the supplied ones?
I've been reading on the internet how to solder the batteries (i.e. don't apply heat for long and 'rough' the ends up first to help the solder stick). But I also read somewhere about 'balancing' the batteries so that they would charge??
The supplied batteries are just linked together (i.e. nothing in there that I could see that would 'balance' them) so thought I would get expert advice on the best way to proceed with this?
I'm fine at soldering but don't want to make a home-made battery pack and then have it blow up when I try and charge it!
I bought a plastic 4xAA battery holder that links the batteries together but it doesn't fit in the tank compartment so that won't work.
Help appreciated :-)