I use the Xvive since few years. The only problem is the battery that cannot be change easily when it doesn't charge anymore corectly.
There are some tutos on the web to do it, but it's not so easy and you need to be meticulous. I did it, I open it completly.
It's set, there is not few screws to opent it. The guy who makes the tuto break one Xvive before he succeed to open one. around 100 $ to the trash.
I'm not satisfied with the answer of Xvive concerning the changing of the battery.
I asked them what type of battery they use and to give me a link or sell one to me.
The answer was that they don't do it (meaning they don't know what type of battery they use and unable to give me the specs), they just offer a 40 $ discout to buy a new one.
The battery I found on ebay is around 7 $ for one.
So their answer is: When the battery is out, buy a new one.
For them, the Xvive lasts the time of its battery, after it's trash.
Fortunately there are tutorials on the web to do it yourself.
Despite of this problem, I'm still happy with mine and will order 2 new battery on ebay when the coronavirus will be finished to do the operation.
I found that one witch seems to have the good dimentions (Length: 30 mm, Width: 30mm, Thickness: 8 mm) and 750 ma.
Rechargeable 3.7V 700 mAh LiPo Polymer Battery 803030 for GPS Bluetooth MP3 752344635034 | eBay