Cordless Toothbrush Dissection - Philips Sonicare

Taking a Philips Sonicare cordless toothbrush apart to see what makes it tick. This toothbrush quit working reliably after approximately 5 years service. Note: I purchased a Sonicare replacement and had to take it (them) back to the store 4 times and eventually gave up on finding one that worked for more than a week or two. They appear to have a programming problem... sometimes it works for only a minute and then not at all... sometimes it will not turn on at all... and occasionally it worked perfectly. Unfortunately I needed one that worked perfectly all of the time. Keep your receipts.I switched to Braun.