Cost per kWh and cycle life comparer
Sticker price misleads. Enter the price you were quoted (we store none) and see the cost per usable kWh and per kWh delivered over the battery's rated life, for up to 4 units.
How this is worked out
- Usable kWh = capacity Wh x usable depth of discharge / 1000. Per usable kWh = price / usable kWh.
- Delivered per cycle = usable kWh x round-trip efficiency. Lifetime kWh = delivered per cycle x rated cycles. Cost over life = price / lifetime kWh.
- Depth (90%) and round-trip (85%) are typical figures, not maker specs; edit them. Cycle figures come from the maker page, with source and date, and are blank where we could not confirm one. Ratings are to a stated capacity (usually 80%), not to failure.
- Typical cycles by chemistry, for orientation only: . Real life depends on heat, charge rate and use, and cost over life ignores charging electricity and warranty terms.
Related: runtime calculator · home battery sizer. We list no prices and have not hands-on tested any product.