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How to charge a 4V 1000 mAh SLA Battery, can I use a 5V 2A charger?


Picture of How to charge a 4V 1000 mAh SLA Battery, can I use a 5V 2A charger?
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_Boltz_1 year ago

never use that directly, instead use a 5v 350ma power supply with a 1N4007 diode,

joelashir (author)  _Boltz_1 year ago

Thanks!

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2.25 - 2.3V per cell, which means you only need an absolute max of 4.6V - anything above and your battery will start to gas out.

If you have a box of junk electronics see that you can find a diode with suitable voltage drop of around 0.4V- 0.5V.
If your charger provides a bit over 5V with no load a standrand 4007 diode should do the trick.

You should also consider a resistor to limit the charging current.
With that added to the diode and the output voltage between 4.5 and 4.6V you are good to go.

joelashir (author)  Downunder35m1 year ago

Thanks!