Upgraded 800mAh 3.7v Li-ion Electric Toothbrush Replacement Battery Compatible with Philips HX9360 HX6340 HX6610 HX6970 HX6511 HX6711 with Extra Rubber Seal
How to Change the Battery on a Sonicare FlexCare Toothbrush - YouTube
Million Magnets Rechargeable 800mAh 2.4v NI-MH Electric Toothbrush Replacement Battery for Philips HX6210 HX6220 HX6230 HX6240 HX6250 HX681701 HX681050 ProtectiveClean4100 HX625481 HX6263 HX6275