@anon11367638 From my experience, it has been about 5 days with regular use. And what I mean by ‘regular’ is calling, texting +music player (and with texting when it’s plugged into Mudita Center, it does charge up a bit).
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Thats great for modernized dumphone.
It seems its possible to order even single batteries from 
Shenzhen Elite New Energy Co., Ltd.
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