Calling all geeks! I've been bit by the bug and I'm gonna build my own 20W 12V Halogen rechargeable. As you can imagine... I've got a few questions. This time it's about battery options. I was down at Fry's on my lunch break looking at batteries and I'm wondering if anyone here can tell me how long the following units might power a hardware store variety 20W 12V halogen given a reasonably efficient wiring harness.
1: 12V, 4 Amp Hour, lead acid battery - pretty freakin' heavy.
2: 12V, 1.2 Amp Hour, lead acid battery - about a .3 the weight of the above, and very manageable.
3: 10 AA NimH rechargeables
Thanks for any help in advance. DanO