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gnomed
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Dec 5, 2014
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PacketCollision
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Dec 8, 2014
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gnomedRegarding your second question, the official product page at http://www.juicedsystems.com/portable-battery-charger,external-battery-charger,power-bank,portable-power-bank states that it can power both ports at 2.1A at the same time.
The answer to the third question is a big "it depends", since both the type of cells and the charging circuitry make a big difference in what is and isn't a good idea. I'm assuming the cells are Lithium Ion, and if that's the case, you should always store for extended periods of time with the pack charged, preferably between 50% and 80%, but 100% should be ok as well. Batteries are surprisingly complicated, and there's a lot of misinformation about what is and isn't good for them. http://batteryuniversity.com will give you more info than you ever wanted to know. There's no problem keeping a Li-Ion battery plugged in when it's fully charged, because Li-Ion batteries are required to have circuitry that stops the charger when it's at capacity.
The answer to the third question is a big "it depends", since both the type of cells and the charging circuitry make a big difference in what is and isn't a good idea. I'm assuming the cells are Lithium Ion, and if that's the case, you should always store for extended periods of time with the pack charged, preferably between 50% and 80%, but 100% should be ok as well. Batteries are surprisingly complicated, and there's a lot of misinformation about what is and isn't good for them. http://batteryuniversity.com will give you more info than you ever wanted to know. There's no problem keeping a Li-Ion battery plugged in when it's fully charged, because Li-Ion batteries are required to have circuitry that stops the charger when it's at capacity.
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I would actually be all over this, ever since my cell phone battery died while I was lost in a big city (there were other stressful circumstances too I will not get into) I have been pretty obsessed with having a portable battery at hand somewhere. This is a little bit overkill for that purpose though since it could probably charge my cell phone fully about 9 times over. I am getting a tablet at Christmas time I believe which might be more of a use case for me. I have used portable batteries while camping quite a bit to watch movies on my tablet and recharge/power some portable speakers (and the odd cell phone but we don't use those much while camping).
I am just sitting on this a couple more days. Managing/pacing my finances and I have other people to buy for more immediately at this time of year. I doubt this would make it in time for the holidays (if I knew anyone else who would want one). But maybe if I have some money leftover next week I will treat myself.
A few minor questions that don't really affect my decision too much. First, how long does it take to charge this bad boy (assuming a 2.1A wall charger)? With that capacity only being charged my microUSB, has to be a non-trivial amount of time.
Second, when charging two devices at once, are the amps split between the 2 ports? i.e. does it become a 1A charger when charging 2 devices? I have seen that in circuitry in the past, but I would hope manufacturers are moving away from that with the big demand for 2.1A charging these days.
Finally, what is the best way to store this thing for long periods (months)? I could probably google this, but whatever. Should I store it while fully or partially charged? Or should I manually discharge it as much as possible if I know I am going to be storing it? Or (preferably) is it safe to keep plugged in for long periods of time (so it can be ready at a moments notice)?