Electronic – Convert SLA laptop battery to NIMH

batterieslaptopnimh

I have an old laptop that uses a SLA Battery and I'm wondering what sort of circuit would be need to convert the charging circuit for NiMH Cells.

Many manufacturers were able to do some time ago but that information has been lost. The Replacement NiMH Battery had two 6v banks and the computer will output 7.5v to the battery when charging. So I assume I'd need two 45C temperature cutoffs (one for each bank) and also a boost converter to a voltage regulator and then a NiMH charging circuit but I can't find a circuit that will allow the same input and output since the battery only has 2 terminals.

NIMH battery

Best Answer

I found this charger circuit : Modified googled NiMH charger And modified it so that it should be able to both charge the batteries in parallel and discharge them (minus diode voltage drop) back to the computer when power is disconnected. I would reccomend low-drop (Schotty) diodes to minimize loss. I hope this helps!

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