Also called the SLA.

Very similar to the flooded battery except the acid has had a gel added to it to make it more or less solid and the pressure release lids are no longer needed.

A wide variety of capacities.

Update there is a thory that a SLA battery can be reconditioned by charging and then discharging (fast) about 10 times.

I have tried this technique with a few 6 Volt batteries with variable success, some batteries recharge and then begin to hold charge others are simply to damaged internally.

This became relevant for me as i recently found a large capacity 12 volt SLA and I’m attempting to recondition it using a battery charger and a 50W halogen bulb for discharging and I’m currently at the second discharge cycle.

So with a 50W bulb how much current will I be using?

P= V x I

50W = 12 V x ?A

50/ 12 = ?A

4.16 = A

Wires rated for 10A so no problem.

<pictures of SLA and cross section diagram>

A more portable version of the car battery weighing in at 1.5 Kg for a 7.2 amp hour battery.

Cost $25 for 7.2 Amp hour battery