49mm x 14mm Li-ion Toothbrush Battery - ToothbrushBattery.com
800mAh Li ion Battery for Philips Sonicare Flexcare Toothbrush repair battery rechargeable battery with nickel sheet|Replacement Batteries| - AliExpress
Replacement Toothbrush Battery for Philips Sonicare Li-ion 3.7V AA Lithium HX | eBay