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Connect the battery positive pole to B+, connect the battery negative pole to B-.
Output load indication: After connecting the load, long press LED switch to start the output. Then screen would show the word 'OUT' and output voltage/current 5V/1A or 5V/2.1A.
Protection function: Integrate lithium battery protection circuit to overcharge, overdischarge and overload.
Can connect one lithium battery or multiple lithium batteries in parallel. But the following conditions must be met: capacity≤20W mAh, 3-4.2V voltage.
Charging indication: LCD screen would display the word 'IN' when charging.