I've got an ASUS Chromebook Flip C100, which comes with a 12v, 2A charger (i.e. 24W), using a custom jack.

I've also got an Anker PowerCore 13000, which doesn't provide enough power to charge the Chromebook (2 ports, max 3A, 5v; so 15W), even if the cable (and voltage) was compatible.

Does anyone make an external battery pack which would be able to do this?
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-- roger