I'm interested in building a portable PA system (on a small wheely-cart) that's very loud (particularly strong in bass, which uses a lot more power than treble) to be used in short increments of time and then recharged at the wall.
What kind of battery do I want? Li-ion, Li-poly, Lead acid, etc?
The battery should be able to deliver say 200W constantly for 10 minutes.
I realize I will need to learn about capacitive circuitry to "buffer" the load between the battery and the constantly-fluctuating amplifier draw, but that's a different question for a different OP.
....bonus question: if I can afford it, would it be suitable to simply use a large number of identical Li-ion cells in parallel?