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This power bank allows me to store energy in many cells for later usage so, it is very useful powerbank for outdoor activities. Energy capacity is only limited to how many cells you have( for example one, two, four, eight ...). charging current(AC - Powerbank) seems to be approx 2A and (Powerbank - Output) 2A max for both ports(summarized). I don't know why, but sometimes is not possible to charge powerbank and charge device from powerbank at the same time. I used 3A AC 5V charger as input to powerbank but there was no constant power output from power bank to device, only short pulses. I have to say that there was problems with overheat sometime but it depends on quality of cells used. So I can say that there are many advantages over a conventional power bank with an integrated battery. - overheating in some cases - charging AC - Power bank - Device at same time is not possible sometimes + unlimited capacity you can store + possibility to easily replace old cells + 2 usb charging ports (2A current)Read full review
Verified purchase: Yes | Condition: New
Total junk. I have a Nitecore D4 charger, which I love, and which has given me years of service. I figured the new F4 was a great idea - "two-way charging." Well, the idea is great, but Nitecore did an Epic Fail on the implementation. I tried two of these units, and both of them were defective. The LCD screen has a very narrow viewing angle, by design; I've confirmed that via other reviews, as well. But what's worse is that both units I tried had multiple missing LCD segments, nor did it display the data as advertised (did not provide me true voltage and mAh). Avoid this; find something else, even if's a separate charger and power bank. Photos shown are of the actual units I tried.
Verified purchase: Yes | Condition: New
good performance charging the batteries and useful as a back up
Verified purchase: Yes | Condition: New
Works perfectly! I bought 4 good Samsung 18650 batteries, charged them and ran a usb fan for more than 25 hours.
Verified purchase: Yes | Condition: New
Its work perfekt!
Verified purchase: Yes | Condition: New