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I have the same issue bad battery. I took the battery pack out and it is actually 2 battery’s taped together. The Specs are 3.7v 1100 mAh 4.07Wh each. Battery size is 4.5mm thick 35mm wide 62mm long which equals out to this part number (453562). I found a some batteries on eBay that are 402863 and ordered them. I will solder them to the original circuit board when they arrive and let you know if they work. If so I may make some battery packs since apparently nobody has them.