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.gaz.
Friad not. But do remember that there were usb chargeable AA batteries around. Quick google shows these on Amazon, no idea if they are any good but something similar might be a possible option? https://www.amazon.co.uk/Eco-Cell-Rechargeable-Battery-Pack/dp/B019IN7T80
Can imagine most of the rack mounted lights will be AA or AAA powered for convenience, and as sizenisnt as critical if it’s rack mounted vs helmet/seatpost mounted.