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This electric bike battery looks like a water bottle : r/mildlyinteresting
UK 36V 10Ah Lithium Li-ion E-bike Bottle Battery For 350W 250W Electric Bicycle | eBay
Newest Mini Bottle Battery 36v 5ah Small Ebike Lithium Batteria For 250w 350w Electric Motor Scooter Bicycle With Kettle Holder - Electric Bicycle Battery - AliExpress