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I finally got around to disassembling the HBS 770. This model is a bit harder to take apart than previous models.
The stock battery in this model is 551140 3.7V 210mAh. It is 5.5mm x 11mm x 40mm.
Here is the battery I intend to try as a replacement (will need some modifying) :www.amazon.com/gp/product/B01...
Thanks for watching!