The “jumper” solder points need to be bridged again for it to work
my toothbrush had a sony battery in it and was about 5 years old when I replaced it. Some of the replacements available on popular sites are not sony. I opted to buy a good brand 14500 battery without the tabs and just solder my own wires to it.
While you have it apart I recommend that the other ifixit guide is followed to get the correct distance between the coil and magnet for best performance
you have to resolder the jumper, it is required. this must be a saftey thing to isolate battery from pcb while you work on it. recommend that magnet adjustment is done while you have it apart. I used soshine 14500 900mAh battery and soldered some wires to it for pcb attach. I didn’t truest the probably fake specific batteries on ebay that are being sold at inflated prices. The battery I removed was a sony one not sanyo as being sold on ebay. p/n 4235 010 13068
You have to resolder the jumper when done else it doesn’t work, I presume its a safety thing because you are working with a live battery and a metal tipped soldering iron. I would recommend looking at the other guide for magnet adjustment on here and carrying that out when the battery is removed, I expect most will need this done after some use the coil and magnet move closer together, toothbrush gets noisy and weaker. for reference my battery was a sony one not sanyo. the part number 4235 010 13068. They are 14500 battery with tabs for PCB mount. the specific ones sold on ebay are expensive and possibly fake. I just got a pack of 4 soshine 14500 900mAh and soldered wires on to attach to the pcb
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