Machines will not draw power from an RE battery if they have an energy storage upgrade unless/until the capacitor drops below the level it would be at if it didn't have the upgrade at all.
Bug: RE Batteries and ES Upgrades
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I think thats intentional
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try energy crystals or lapotron crystals. Reasonably certain this is intentional.
realistically it's better to have them hooked up to power anyway.
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I'll have to check for energy or lap crystals. And not always, for example if the miner takes upgrades I fully intend to drop a couple energy storage upgrades into it to charge-and-forget it.
you have to change the config file for a miner to accept a lapotron but it's very possible.