While SLA (Sealed Lead Acid) is the most inexpensive option, about AU$2000 to $2500, all the research tends to indicate that they will only last between 400 and 600 cycles (discharge, recharge cycles). Charging once per day, that's 16 to 24 months. In addition the "pack" will weigh around 320kg. Not only does that put the car over original weight - a problem for road approval, but it will have lower performance.
170kg in a 1000 kg car is important. Why 170kg - because that's how much less a Lithium Iron Phoshate battery pack would weigh. The LiFePO4 pack would also have almost twice the range as it does not suffer nearly as much from "peukert effect" http://en.wikipedia.org/wiki/Peukert's_law. Finally, Lithium should last 2000 to 3000 cycles, that's around 6 to 10 years with my expected driving distances. A LOT more expensive though!
My Lithium batteries of choice are 10 of these 60V 20AH packs from Headway in China. (The blue cylinders are what is in the big white box - 40 of them. I earlier had this at 20 - there are actually 40 cells per box.)
Weighing 15kg each, using these bring the theoretical weight of the car in under it's original weight by about 40kg.
The house mortgage is down since we sold our caravan (temporary situation), so finance is possible...
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