DiamondClean HX9368/35

HX9368/35 (Sonicare Diamond Clean), purchased 2018. 2020 I was concerned about the seal flaws, so I purchased a new designed seal from eBay, a UK seller. Fitted it. Haven't had any issues. I open it yearly to inspect internals for any corrosion. 2025(December) the "white" LED is dimmer than the others. But I've never used the other modes honestly, only ever used the "Clean" mode. I never kept it on constant charge, only when the battery indicator shows amber, then I place on charge.

I had one of the old diamondclean models and it stopped working so i ordered a new diamondclean model from philips which was useless - i ended up buying the older model from aliexpress and it worked perfectly

I had an old diamond clean that just died now after almost 13 years, it was the one from costco that included a UV cleaner. The toothbrushes are much more expensive now, i think im going to try a 5100 due to their price on amazon.

Search the sub. Get the sonicare 2-pack from Costco. It’s like $100. 

Costco has sonicare 2 packs on sale for $69. Worth it!

Agreeing with you, we've bought 2 of the Costco Sonicare packs and will be switching (likely to OralB) because these brushes, without fail, will loosen and vibrate as loud as a magic wand when they fail. Not a BIFL product IMO. Great product when they work, frequency and pressure sensing are awesome out of the box.

The Philips Sonicare pack that Costco sells is the best toothbrush I’ve used in the last 15 years or so Stay away from smart features or Bluetooth capabilities and all that. It’s all gimmicks and kills the battery.