Upto 1:30Hrs Backup in 100% Vol.,
obviously it will give much more backup in Mids.
Highlights:
• It's Condition is Same as New one,
• Gently Used,
• Working Perfectly, Come check it freely,
• Power Output (RMS): 14 W,
• Wireless range: 10 m,
• Built-in mic for hands free calling Using simple touch controls change music tracks and control volume,
• IPX 5 splashproof- Enjoy music even in the shower/ rain

Note: to be on safer side, I mentioned the battery backup as low as possible, but it can give more backup than that,
And what u see on Google or What battery backup company claim, is measured in 50-60% Volume only.