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Lithium Battery Board + Acrylic Box + Fan + Heat sink + USB Cable Kits
Features: For Lithium battery expansion board: Battery capacity: 3800mAh Maximum output current: 1.8A Output voltage: 5.1V ¡À 0.1V Double USB output; Standard charging current / voltage: 1.0A/5.0V It can last about 9 hours if only pi 3. The Lithium battery expansion board can be also used on cellphone. Note: You can charge this battery even if the switch is turned off