Mini UPS Uninterrupted Power Supply 7800mah 12V 2A USB 5V 1A Output Power Bank (GM312 UPS)

I’ve experienced a few power cuts (and hating the long sync times that occur after a power outage) recently and while I already have a big UPS for my main PC and monitor, I don’t have anything to protect my router because it’s in a different room. When I opened the packaging I examined the mini UPS unit and I was surprised at how small it was. It seemed to be made from good hard ABS plastic and had a nice weight to it. Also included in the box was 3 x barrel jack adapters, a barrel lead and a 12v UK power supply. On top of the unit it had 2 LEDs (1 green & 1 red) to signify battery status, with the red LED only lighting when the internal 18650 batteries were charging and the green LED indicating that unit had AC power. There was also a button on top which was just an on/off switch. On the back of the unit it had various connectors, these were: a 5v USB port supplying 1 amp, a 12v barrel connector (for output voltage) and a 12v power input port for connecting the included power supply. I connected the device up to my Virgin Super Hub and it seemed to be already charged up but operation wise the Virgin router seemed fine with no speed or stability issues. This mini UPS has functioned great since I’ve had and although there’s no audible warning when the power is cut it has just done its job effortlessly (what more could you ask for). I can thoroughly recommended this for those people with a VM Super Hub 2ac (and SH 3 as it’s the same PSU) - it’s easy to setup and doesn’t require much attention once functioning, top marks. I’ve included various pictures. Thanks for taking the time to read my review.

This works exactly as it should and runs a router for a time if the power goes off. It is good value for what it does. I have not yet tested it to see just how long it will run the router but it definitely works for relatively short interruptions. However, I can confirm the comment in another review that neither the supplied connector nor the adaptors will fit a BT Homehub. In quite extensive research, I failed to find a ready made alternative connector that would fit. After a lot more research, and measuring of the plug needed, I finally found a supplier of the correct plug and so was able to replace the plug on one end of the supplied connector. It all now works perfectly and I am pleased with the unit but if you are not handy with a soldering iron and want this for a BT Homehub, you may have problems.

This was a promising proposition - get a few hours of broadband wifi even with the mains power off. Unfortunately the 2A output at 12V seems aspirational. I checked with a meter and here's 12V across the terminals, but I couldn't even power up a 12V/1A rated network switch with it, let alone the 12V/2A Virgin hub 3 or anything else. It does charge a mobile phone OK, but it's expensive for a power bank, if that's all it really can do. UPDATE: I managed to find a 12V device it would power up. A decorative light rated at 0.5A. Not much benefit to UPS functionality there though unfortunately!

Looks like a high quality product – well packed, quality materials, compact. It powers my Vodafone Broadband router for about 3 hours, despite the fact that the router was shipped with a 2A power adapter and the Mini UPS only outputs 1A. After the UPS battery was depleted it took about 6 hours to fully charge again while still powering the router. My only issue with the product is the slightly rounded design which makes it impossible to stack them, but I'll work something out. Later edit: these work ok-ish linked in series, but if any of them is charging the current is reduced to the point that my Vodafone router continuously keeps restarting, but works ok if both UPS are fully charged; so after a power outage the ups need charging before connecting to the router, which is very inconvenient; this doesn't happen at all with just one of these UPS

Returned mine after test run. It powered a router for a couple of hours but then failed as the deep discharge protection was faulty or absent. The lipo discharged to 0.3v and would not recharge afterwards. I also doubt that it has 7800 mah capacity at 12v as I have other 3s lipo batteries with 2400 mah capacity that are bigger and heavier than the whole unit. To their credit it was refunded without quibble.

I've a bit of an interest in microUPS and battey packs so when I spotted this I thought it was well worth looking into. First a personal bugbear...Why do suppliers like to quoting capacity in mAh for battery packs and in this case a mini-UPS, it is so often misunderstood. Much more useful is to quote WattHours (Wh) and actual delivery capacity in %, thus avoiding the need to work out what the nominal voltage of the batteries is; it makes it so much easier to work out how long it will supply 5Volts and 12Volts for a given current demand. So 7.8Ah*3.3V (18650 cells) =25.7Wh, for a Li-ion UPS the minimum safe remnant charge is, likely to be ~20% so we have a useful capacity of 20.54Wh. If my 12V router uses 9Watts I immediately know it should run for around two and a quarter hours, if my 5V camera needs 0.5A, (2.5W) it means it will run for at least 8 hours. As for the checking the accuracy of the calculations I've run a load test on the 12V output into the 6.8Ohm load the unit ran for 1hour,11.69/6.8= 1.72Amps, which equates to 20.1Wh. Similarly the 5V output (actual 5.079V) discharged into a 10Ohm load ran for almost 8 hours, so 8*2.5Watts= 20Wh. One oddity on the unit supplied to me was the On/Off switch had a raised sticky pad surround it, probably to stop accidentally switching the UPS off. That said it's really rather difficult to tell if the UPS switch is In(off) or Out (On) perhaps <1mm difference in height. Once the unit is plugged in and is fully charged up, the Red LED is extinguished, so now ask is the UPS function active or not? one option was to peer closely at the switch to see if you could discern a difference in height. Doing this I actually realised with the button IN the UPS is actually OFF (not what was expecting). The only other simple way I found to check its status was with the AC on and the unit's Green LED illuminated, press the on/off button once then switch the AC off, if the Green LED fades after a few seconds the UPS is actually switched Off, if the Green LED remains lit the UPS is ON. Some reviews have said it didn't function as a UPS perhaps misinterpreting the switch position was the issue. The other issue I have with the unit as supplied is that is nominally a 12V/2A and 5V/1A capable UPS. However if you have a device rated around 14Watts (@12V)or more you will have problems. I've looked at all sorts of powerbanks and DC UPS and so I've a standard set of simple tests to see how the unit and AC adapter provided performs. First the open circuit voltage with no Load, 12.06V with AC on and 12.39V with AC off, then when linked to a 6.8Ohm load the output is 10.95V with AC on and 11.69V with AC off, this rather looks like the relatively small AC adapter that is supplied is struggling to maintain its output voltage as the current demand gets to around 1.5-1.6Amps. Having looked again at the limited UPS user guide, this actually predicted if you can understand the phrase "Applies the adapter which is power above 1.5A when the device power is 12W" The simple fact is the AC adapter that has been bundled with the unit is rated at 2A, and I'm guessing around 500mA has to be reserved for keeping the battery charged which leaves 1.5A or around 18Watts. A better solution would be to have the unit supplied with a 2.5A AC adapter then it would meet the specification. One nice feature was the selection of DC adapters provided but no sizing information was given.Initially I thought these were for connecting the UPS output to different style router connections, but given their form I now suspect the UPS manufacturer included then to allow different AC adapters to be plugged in. The one feature I really liked is that both the 12V output and 5V output can be powered at the same time and protected by the UPS function, this is particularly useful if you have to keep a couple of devices live during a power outage. The max current supply will still be limited by the AC adapter used less the ~500mA for battery charging.

This is definitely not a 7800mAh battery pack. The seller is under the misconception that the three cells inside wired in series give 3x the amount of power which is not the case. Because they are wired in series they only give 1x the cell power which is 2500MmAh. I measured this on a dashcam and the battery pack was exhausted after supplying 2390mAh. I bought this UPS to power my dashcam as it is A LOT cheaper than other dashcam power supplies which are WAY overpriced for what they are. This is a power pack that can charge and discharge at the same time which all other USB power packs for mobile phones can't do and supplies power to my camera for 7 hours when the car is parked and then charges when I am driving. It does not fully charge it and I have to take the pack into the house to complete the charge. Also, I have not had a problem with completely discharging the cells and then it taking a charge. As far as I can see this is the only one on the market at a decent price.

Perfect for a job that requires both 5 & 12v. Love the size of the unit and the price point is unbeatable. Sadly it's Not CE marked so not sure what goes on inside the box is legal regarding battery composition etc and whether or not if a fault occured if it would handle it correctly. The fact that the led slowly diminishes with charge is telling me that the battery/charge monitor is probably too simplistic.