SLA Float charger

ian field

Joined Oct 27, 2012
what guys think about this SLA float charger ??
is it good and safe to leave battery permanently with it ???

thank you
Various commercial "intelligent" chargers do this - the Optimate charger I have throttles back to 13.6V to maintain the battery with minimum gassing.

If you go for your own design; I'd suggest a comparator that trips at 14.4V and flips a bistable that sets the charge voltage down to 13.6V

The absolute simplest is a constant current charger that switches in a 13.6V shunt regulator - but you have to feed from the shunt to the battery via a rectifier so the shunt can't discharge the battery.

Thread Starter


Joined Nov 18, 2015
i need a float charger for SLA 2.2 AH to 12 AH and i have to leave the battery plugged to the charger permanently
any circuit or link suggestion please ?

thanks again