Thank you for a great guide!

I'd just like to add two things:

- The guide says to "Push the toothbrush into the charging station with mild pressure". I had to apply rather extreme pressure to get it to open. A pro tip is to push the charger and toothbrush against a rubber surface if you have one available. That will make it easier to apply the pressure needed to unscrew the bottom cap.

- If you're in the U.S. I can highly recommend the Tenergy Li-ion 14500 Cylindrical 3.6V 750mAh Flat Top Rechargeable Battery (without tabs). I can confirm it works and recharges perfectly, even though the original battery is a 3.7v, and this is "only" a 3.6v.