What's the terrain like on your commute? If it's hilly, you may be able to close the time gap by using most of your assist on the uphill bits - in other words, without running the pack into the ground flat-out all the way there.
I like dremd's idea of spending a bit more up front for a good quality nimh pack though. If you size your pack properly, and treat it nicely (proper charging), it'll last a LONG time.
Toyota used NiMH in its RAV4 EVs, and some have gone well past 100k miles with no significant loss in capacity.
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