Review (5/5): Had mine for over 2 years now. Fix for water infiltration !
Bought 3 Sonicare brushes, 2 rechargeable and 1 e3000. All are doing well. I noticed the potential for water in the battery compartment. I had some silicone grease, used mostly for automotive applications. Suggest Danco Perfect Match: Silicone Grease, Amazon 88693, $0.19. Smeared a bit on and around the battery cap and o-ring. Now it is totally water tight, and changing batteries is much faster than the rest of family waiting on a recharge. Use quality Alkaline batteries, to avoid the batteries leaking.