Photos as requested

I plan on using a battery of that type, not some rechargable AAs.

If I have a circuit board that only works enough to charge a battery, like mine is right now, I could build a charger for the spare battery and charge it separately while suying the M6 battery.

Thanks for the note Hyzenthlay

BDW what's the max mAH available?

Regulate it .... Surley thats not exactly the 3.7 v the player uses , If you use the internal battery and the external one that youve added and put a regulator board to 3.7v on (Or whatever the standard m6 batterys voltage are) youll get combined capacity of both batteries.

Cool, but instead of drilling a hole in the back of your player, I would suggest drilling the hole somewhere along the side of the player. Solder a jack of some sort to the output of the battery, and stick the female version of that jack into your player, and viola you have a removeable external battery. Without having to dish out money fo the Meizu one.

Any quick safety tips / hints to open up the cover to change the battery? Would be grateful to know best method and what to look out for before I break anything.

Thanks!

Hi and Welcome to the Forums! Why do you need to change the battery? Is it dead? If so, at the moment, there is no replacement M6 battery that you can buy, but you can remove that dead battery, solder on the iPod battery, drill a hole in the back, much like how Madman did his mod. To open the case, just jam your thumbnail somewhere along the side of your player, and bring it around the whole perimeter of your player, it should pop open once you get back to where you started (Stick your nail into a crack, drag your nail around the player while it is still in the crack). Hoep this helps!