If you are using a 12v supply, nicads in a suitable configuration will supply anywhere up to 30amps plus....they can be fast charged but obviously suffer from the dreaded memory effects......
Nimh's on the other hand can supply the same amout of power, cant be fast charged but dont suffer from memory problems........
Then there is the KAN cell.....typically the same chemistry as Nimhs but smaller and more compact, will deliver currents up to around 15 amps...
SLA batteries are a little on the heavy side, you must not discharge them below around 11v for a 12volt battery or it will suffer permanent damage.