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Brand new and high quality.
Description:

Battery capacity: 3800mAH
Maximum discharge current: 1.8A
No-load output voltage: 5.1V 0.1V
Standard charging current/voltage: 1.0A/5.0V
Cut-off voltage of fully charging the Li-ion battery: 4.18V - 4.2V

Package included:
1 x Lithium Battery Expansion board (with lithium battery)