Dayton Audio's LBB-5v2 battery holder board delivers high current portable power to small amplifiers, 200W amp boards, or other 21 VDC projects by combining the voltage from five 26650 Li-Ion batteries (sold separately). It's small enough to fit inside a medium size portable speaker and has multiple 21 VDC outputs to power an amp, tone control, Bluetooth, and other preamp component boards. It also has a 12 VDC output to power lower voltage preamp/accessory boards. Enjoy the extended listening time you get from Li-Ion batteries on a single charge. 26650 Li-Ion batteries come in a variety of amperages, and to get the longest playtime from a 200W amplifier or amp board use at least 5000mAh batteries. 
There's no need to remove the batteries from the holder because the Dayton Audio LBB-5v2 has a built-in charge circuit. Just plug in a power supply and the over/under charge circuit prevents correctly installed batteries from overcharging and fully discharging, shortening their life. The LBB-5v2 battery board needs a 5 to 24 VDC power supply (sold separately) t

Dayton Audio's LBB-5v2 battery holder board delivers high current portable power to small amplifiers, 200W amp boards, or other 21 VDC projects by combining the voltage from five 26650 Li-Ion batteries (sold separately). It's small enough to fit inside a medium size portable speaker and has multiple 21 VDC outputs to power an amp, tone control, Bluetooth, and other preamp component boards. It also has a 12 VDC output to power lower voltage preamp/accessory boards. Enjoy the extended listening time you get from Li-Ion batteries on a single charge. 26650 Li-Ion batteries come in a variety of amperages, and to get the longest playtime from a 200W amplifier or amp board use at least 5000mAh batteries. 
There's no need to remove the batteries from the holder because the Dayton Audio LBB-5v2 has a built-in charge circuit. Just plug in a power supply and the over/under charge circuit prevents correctly installed batteries from overcharging and fully discharging, shortening their life. The LBB-5v2 battery board needs a 5 to 24 VDC power supply (sold separately) to start the charging process and to start its output power. This enables you to listen to music while the batteries are charging with this amazing battery holder.