Replacing the dead batteries in two of my Braun Oral-B electric toothbrushes. This is for the Precision 4000 and Smart Series 5000 which are the new versions of the old Triumph 9400 and 9900. These were the more expensive "professional" series which were $80 to $120 new so its worth the $18 for replacement battery after 5 years. I used "OEM" FDK brand (Sanyo) Japanese cells from an Amazon toothbrush repair seller.

OEM FDK 42mm 2,150 Cells - https://amzn.to/3b08baa
OEM FDK 49mm 2,700 mah Cells - https://amzn.to/3qgpwCd
Air/SMD Soldering Station - https://amzn.to/3jM99Li
Solder Sucker Pump - https://amzn.to/3rUFFh7
This soldering kits comes with solder, twizzers, and everything you need to do the job. https://amzn.to/3zxXuGD

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