It is covered mainly in the feather topics.

But, a normal setup for a modern machine is with LiPo or LiFePo4 technology.

If it is for Supernova or simular machine. I would go for this setup.

4 packs of these
Giving you 37V 16 Ah (comparable with at least 25Ah SLA), with a burst load of 640A.

If you want more peak load capacity, 6 packs of these wil give you 37V 15Ah and a whopping 1050Ah of burst load.

Charging the packs I suggest. Depends on speed you want to load them.
If money is no objection and you have a powersupply that can handle this monster, go for it.
I'm intending to buy it.