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If you want to use more ev, the best is to add lithium cells and charge/discharge them.
The oem nimh cells are not designed to have deep cycles. There life will be shortened.
There are two ways adding lithium to a 2004 prius:
-engineer way, so using a dc-dc converter with max 15A. The converter had thermal problem and the bms could not work.
-direct HV but you need a bms, bms+ or an orion bms. Don't have the 15A limitation and can regen energy in the lithium cells.
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