Just got one copy in from that shop.

Looks good, quite identical to the Jolla branded one.

It works correctly out of the box (it came charged at over 50%)

Temperature indicator seems to be hovering around 28 degrees. I've read somewhere that this battery is supposedly not providing temp feedback to the OS in a correct way,

If I loose my manhood due to an exploding Jolla in my pocket , I am not sure if I will dare to report to Jolla care or even here, so follow my example on own risk..

EDIT: after a few days of usage, I just forgot this is not the original Jolla battery. Excellent value.

About temperatures: a refrigerator test has shown that indeed the temp reading seems to be incorrect (as in displaying a more or less fixed temperature value and not updating to match real temp).