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For new it's worth it provided the owner builds the ~14.4V pack themselves outa the DeWalt A123 cells or similar, at least compared to new. It should last ~20-30 years at least down to ~70-80% of the original capacity. While a new lead starting battery is pretty cheap at ~$50 for a smallish battery, it can only do, say, ~100 complete cycles or the equivalent, and since it'll only store ~.5kWh, that's ~$1/kWh stored. Deep cycle LA is a bit better at ~$.40/kWh stored, but it still isn't close to stuff like A123's cells that are ~10-25c/kWh stored depending on how low they're allowed to go in terms of capacity. It's kinda like the whole NiFe compared to LA deal. NiFe is also cheap per kWh stored, but since it's so much more expensive off the bat, most don't use it.
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