Brand NEW! Dayton Audio KAB-BE 18650 Battery Extension Board for Bluetooth Amplifier Boards The Dayton Audio KAB-BE Li-Ion battery charging board holds three 18650 batteries (sold separately). This charging board has built in under/over voltage protection circuits for safe charging and battery longevity. It balances different voltages between batteries in case one battery discharges faster than the other ones. A 19 VDC, 1-5A power adapter works best for charging batteries contained in this board. Additional boards can be sequenced together to provide longer playing time. Please note: When removing batteries from the KAB-BE, the charging adapter must be plugged in momentarily after the new batteries have been inserted. Failing to do so will prevent the amp board from powering up. Specifications: ? Included cable: 8" 4-conductor ? Board dimensions: 2.68" H x 3.61" L x 1.15" W. - All international buyers are responsible for all tax, duties and/or customs fees.