charger

[wawi0069]

does anyone know how to build a custom charger that can charge 4 AA NiMH battery in parallel sequence... thnx guys

[walter58]

Hello,

I assume that you don't have the intension to load your cells at "quick rate", so let's say that you charge your cells with 0.1 X normal battery current, so in your case, with four cells in parallel, you can charge the batteries with 0.4 X nominal cell current (f.e. if your batteries are 3000maH types,you might charge your cells with 300mA per cell,so with four cells in parallel,your charger has a charge current of 1.2A).
However, most chargers expect the cells to be put in series...
Take a look on the internet at these sites :
http:<//www.electronics-lab.com/projects/power/037
this charger uses the great LM317 3 pins regulator !
http://www.discovercircuits.com/B/batt-chrg.htm
or type "NiMh charger schematics" or "battery charger schematics"
succes !
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