product description:
Notice: 1.Connect 3.7V 4.2V li-ion battery to the soldering point or the battery jack,Activate the circuit by charging with a micro USB adapter,When step up circuit is not activated due to protection circuit of the battery, simply release the protection circuit by inputing a 5V to charging terminals.
2.USE for 18650 battery or 3.7V lithium battery
3.Never reverse the connection polarity.
Package included: 100% Brand New
1X 3.7V TO 5v power module
Worry-free Warranty: 12 months worry-free product guarantee
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