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Very simple NiMH Charger..

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So I wan't to create a simple 1/10 C charger for one of my power tools (a drill) and it is rated at 14.4V and 2200mAH so I should charge it at 220mAH then right?

Is it as simple as just using a 24V powersupply with 1 resistor to get the correct current?

And the resistor shuld be around 43 ohms (24-14.4/0.220)
AND I guess it must be able to handle >2Watts..

Are my calculations correct?
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