Just ordered a “Used, in good shape”, and it seems to be, however, it’s the REALLY original model, with the solid flap on the front, that turns into the stand. SN: 054867920870604AE. Guessing this is NOT the “Soundlink II”, but the original model. Instructions that came with it claim battery will last up to 3 hours. JUST IN CASE this battery is shot, was looking into what’s involved to replace it. However, mine being older, wondering if this battery would still fit?