reTerminal E10-1 Battery & charge info

I got the reTerminal E10-1 module a while ago, unfortunately there is no information about how to charge it, the process of charging the battery (and how to know when the battery is charged by connecting the adapter to the E10-1 module, the charging light flashes continuously!) , and there is no display of battery level in the module! what’s the solution?

For the reTerminal E10, when it is being charged, there will be a charging displayed in the top-right corner of the reTerminal’s screen. However, the reTerminal E10 only has a charging management chip and does not have a battery gauge, so it cannot display battery level information. We apologize for any inconvenience this may have caused you.