In the second purchase, the battery did not work at normal power. I got caught too late to make the exchange process (though during the warranty period, but failure to purchase was not verifiable). There was therefore harm the 2 sides, however the exchange with the seller were cordial.
So I bought a second battery holding 30min ...
I do not advise against buying the first works perfectly (and still after nearly 3 years), but watch return quickly in case of default.