5V 1A 1.5A 2.1A 3 USB Power Bank Charger Circuit Board Step Up Boost Module 18650 Li-ion Case Shell DIY Kit Powerbank

Product description: 1.3 USB charging port, can charge 3 mobile phones at the same time 2. Dual IC control, synchronous rectification, conversion rate up to 90% 3. Using inductors, double-tube rectifier, stable performance 4. Overdischarge, overcharge, and overload protection circuit 5. It can automatically identify the output current of 5V1A or 2A according to the equipment 6. Suitable for 3.7-4.2V rechargeable lithium batteries, such as mobile phone batteries, tablet batteries, 18650 batteries, etc. 7. Connect the positive pole of the lithium battery to B+, and connect the negative pole of the lithium battery to B-. Note that the B+ and B- of the boosted battery must not be connected reversely. 8. The Micro USB port needs to be activated once for the first use

• 5V 1A 1.5A 2.1A 3 USB Power Bank Charger Circuit Board Step Up Boost Module 18650 Li-ion Case Shell DIY Kit Powerbank