How to Change the Battery on a Sonicare FlexCare Toothbrush - YouTube
Philips Sonicare HX5611/01 Essence Rechargeable Electric Toothbrush, Mid-Blue
Upgraded 800mAh 3.7v Li-ion Electric Toothbrush Replacement Battery Compatible with Philips HX9360 HX6340 HX6610 HX6970 HX6511 HX6711 with Extra Rubber Seal