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Thanks a lot for the guide
Unfortunately, lithium battery failure is fairly common and usually results from drops, bumps, bruises, or in-appropriate charge rates but it can be a myriad of little things so pin-pointing any one item that was the cause is tough. (No single raindrop thinks it caused the flood). This particular device was given to me for repair when the battery failed so I don't have the whole back-story for it. Any time an Li battery starts getting hotter than usual or starts to swell, quit using it immediately and have it replaced. These batteries WILL explode and burn and give off some really toxic fumes while doing so. They are not to be dismissed lightly. That is part of why I stress using soft plastic tools around the batteries and going slowly and gently, puncturing one of these batteries can result in 3rd degree burns to the user.
Learn something new every day. Thanks for the explanation.
And if anybody needs replacement battery for M1, you can buy it from our partners at Shenzhen Audio https://shenzhenaudio.com/products/...creen-battery-for-m1-hifi-portable-mp3-player
Cool, I searched for one but nothing came up in google so good to know the direct replacement exists.
I just got the battery from Shenzen. The back panel the original pack is stuck to is glass and the adhesive is super strong. Even being careful with plastic spudgers I broke the panel. Fortunately the battery wasn't breached. Now I have to make a new panel from Lexan. Odd that the battery failed so soon. I just had to replace a battery on a 15 year old iPod Photo that was only at 50% of the original capacity.