Centech 3 in 1 portable power pack/jump starter for repair
The battery inside needs to be replaced. It's a small motorcycle battery sized 12V. That's it. You can get them for $10 or less at RE-PC Repair on 6th Ave S and Massachusetts St. in SoDo, Seattle.
Let me know if you want this, you can have it for $12.
I'm in the Central District area by Capital Hill.
Message me anytime.