Regarding the battery: it perfectly fulfilled its function is to load energy to then allow mobile use of GPS. The installation instructions may be provided with, as well as the tools ... But for less than 10 euros, do not dream ... leaflet is on the Internet, and as the battery is compatible with multiple devices tools are not provided.
But on the other hand, I recall the price under 10 euros including delivery in 48 hours, where others are in the 25 euros ...
So for the price and autonomy found, 5 stars!
