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Pros: Huge capacity for the size/weight. For the few things I need to use it with, it doesn't add much size, but they will run a very long time.Can provide a wide range of voltages.Charges reasonably quickly for the capacity, and indication is clear.Wide range of adaptors.
Cons: DESPITE PICTURE, DOES NOT INCLUDE CHARGER.At least mine didn't, and the internal document explaining how to use it didn't show it. 18v is unusual, but I had a car charger from a different source that did 18v and worked fine.Voltages are not precise (except the USB connector, though I haven't checked it). This is not normally a problem for external charger replacement where a 10% error is normal, or for automotive (12-20v) where most things have to be rated for deep drops during crank to overcharging, or for batteries that discharge and lose voltage. But if you have something that needs a precise voltage (e.g. 14.5 to 15.5) this won't do it.Capacity left is unclear.Adapters require an extension cable that is stiff and thick so occupies a lot of space - so this small battery pack and the router it usually powers take less space than the cable connecting them.
Other Thoughts: I would rate it higher if it included the AC adapter as pictured here (but not in the accompanying documentation). Even higher if it also had a car adapter. It also doesn't give a range around 18v/750ma so I don't know if my 19.5v laptop adapter would be safe, or if my 16.5v would work.The "voltage range" typically will mean, except for 5v (usb) devices, that it will be pack->adapter->device instead of pack->device. I don't know how they could keep it small yet allow finer setting of the voltage, but that is the only real technical complaint I have with it.
Bottomline: As a USB charger, (if you have an 18v power supply available) I don't think there is any better pack for the money (under $10/1Ah). And the capacity is enough to run things for hours. They should include the recharger.