Battery Charging

Thread Starter


Joined May 13, 2013
hi sir/ma'am is it safe to used this battery in my psu circuit? do i need to use a control charger for this?


YB2.5L-C-1(12V2.5Ah) Sealed Lead Acid Motorcycle Battery
maintenance free



Joined Apr 27, 2013
Max, that is not what the OP asked for. I believe he is asking if he can use the battery (as a backup) in his PSU.

The problem with a 12V source and a 7812 voltage regulator means that the output is less than 12V due to the drop from the regulator. One option is to bypass the regulator when the power is off. But you need to be careful that you don't supply 13V to components that cannot take the higher voltage.

It will be fine for the 7805 voltage regulator.

ian field

Joined Oct 27, 2012
With LDO regulators, the battery might keep it up for a few minutes - but not with the diode drop in series with the regulator input.