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I see a lot of EV conversions that use Optima Yellow Top batteries in them, so my guess is that either people are using them a lot because everyone else uses them a lot, or there's something special about them.

As I know Optima batteries have special construction (roll type electrodes) which allow put/get huge currents to/from them. It means fast recharge, easy recuperation and heavy ratings. And of course deep cycle (till 20%) without significant influence on life time.

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