Battery for Philips HX3110 HX3120 HX6210 HX6230 HX6240 HX3100 HX6220 Electric Toothbrush 1.2V 42mm x 20mm Batteries|Replacement Batteries| - AliExpress
Generic Upgraded Version: 800 mAh 3.7v Li-ion Electric Toothbrush Replacement Battery Compatible with Philips HX9340 HX6930 HX6750 HX65
Philips One by Sonicare Battery Toothbrush HY1100/03 | Philips
Amazon.com : Upgraded 800mAh 3.7v Li-ion Electric Toothbrush Replacement Battery compatible with Philips HX9360 HX6340 HX6610 HX6970 HX6511 HX6711 with pins to fit circuit board and extra rubber seal value 6.99USD :