here i increase the battery backup of boat stone 600 blutooth speaker 🔊 by adding additional battery in parallel which cost only 100-150₹ in market or you can find in your old Powerbank. initially it gives backup of 2 hr after 2 year usage. although its charging time increased from 1hr to 3 hr.
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DIY Increase battery of bluetooth speaker 4100mAh
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