I guess, the battery of my SIMpad SL4 died. Its condition degraded very fast recently, and after I had it not on AC power for a week, it doesn't load any more. Strangely the battery monitor shows 100%, no loading going on, and when disconnecting AC power, it turns off immediately, with normal boot on AC power restore.
I already searched on ebay, for "simpad", as well as for "CGA103450", but nothing came up concerning a battery replacement.
I already read some postings, suggesting to fiddle around with mobile batteries and cell replacements, but all that info is quite old.
What's the recommended way nowadays to give it a new life independent of AC power?