Electric Vehicle Forums

I was looking for this information a few weeks back and I finally re-found it. This is from OVONICS the guys who basicly invented the NiMH EV battery for the GM EV-1.

How many years will a NiMH battery last in automotive applications?
Advanced battery technologies are typically evaluated in terms of complete discharge cycles. A standard electric vehicle battery can be charged and discharged 1,000 times to 80% Depth-of- Discharge equivalent to over 100,000 miles. Hybrid vehicle applications use batteries very differently. Typically, the emphasis is not on energy storage, but on power density. The battery is, generally, never fully charged or discharged in hybrid applications. Ovonic NiMH HEV batteries can be cycled in shallow discharges hundreds of thousands of times and last over 200,000+ miles under a partial charge/discharge regime.

Chris Brown