Retailer Bose SoundLink Mini speaker

Product Name: Retailer Bose SoundLink Mini speaker
I got it at the estate sale with other speakers . It might have a battery problem, when you plug it in the charging light comes on , if you unplug it right away it says battery is charged 100%. It connects to your phone through Bluetooth but Disconnects in about 5 sec. Just keeps playing that “connecting/disconnecting” game. Last night I left it charging for few hours and all of the sudden it stayed connecting to my phone and played music. So it might be a battery issue where it keeps shutting off that's why it disconnects. Not sure ! Music played beautifully ! And the speaker talks when you turn it on/ off and reset it as well I do retailer not have the original charger but it takes a standard android USB cord to charge.