Some tips about battery
1. Don't disassemble the tablet by yourself, unless you are sure you can handle it or you have to do this.
2. If you have to disassemble it, please be more careful. Don't use knives or screwdriver to stab the battery.
3. After you remove the battery, please don't use the same battery again. If you have to use it, check twice before you use it. Make sure the battery is intact.