Eaton 3S Mini – DC UPS 36 W – 3SM36B – DC outputs 9/12/15/19 V, 4 barrel tips – Li‑ion – Black/White (B092TG9M7C) – United Kingdom, G...

I live in an area subject to irregular, but relatively frequent, power cuts. Four in the last month, each for a variety of reasons, and each lasting a couple of hours or so. The usual apologies from the supplier (Northern Powergrid) but no confidence matters will improve anytime soon. When they're blaming squirrels you know you're in trouble... Unfortunately, the mobile networks go down too, so our entire village goes off the comms grid. With BT digital voice allegedly coming next year we will be deprived even the trusty landline. So some kind of contingency makes sense, if only for emergencies. There are any number of these units on Amazon, and you have to pick one, so the Eaton 3S mini was it. Arrived in a couple of days. Easy to set up. Although it has 4 dc power outputs the default setting is 12V, fine for the BT hub we have. There are 4 barrel connectors included, one being 3.00mm which is compatible with the modem. It fits, and that's good enough for me. Took about 10 mins max to install, let it charge overnight, then switched off the mains power to the hub this morning. The latter continued to function. So far so good. We'll have to wait for another power cut to test in in real world conditions, but assuming the back up batteries in the BT street boxes are good for a couple of hours then we should be ok. We'll see. Update 4 July 2024 Another power cut this afternoon. 6 now in 7 weeks. Step forward Northern Powergrid... We were reconnected to the mains supply after 1 hour 45 mins or so. The backup battery kept us connected but judging by the status lights on the front I guess we had another 15 mins tops. So 2 hours powering a standard BT modem

I own three of these units. Two worked great during a power cut yesterday, but one of them instantly dropped the output power. They are all around 12 months old. The one unit which failed had actually been fully discharged once, several months ago during a previous power cut. The other two units did not fully discharge, because they have very light loads (~3 watts vs the ~9 watts attached to the failed unit). Both of the lipo cells inside (TP LI-ION 3.7V ICR18650 2200mAh MH46259 UD020) now read at roughly 0.125 volts, so my /assumption/ is that these are unprotected cells and the unit itself does not have a low-voltage automatic cutoff. This is extremely problematic, because whenever there's a lengthy power cut, there is a solid risk that the unit itself will then be bricked unless you want to manually replace the lipo cells inside. So I'm afraid I need to give the "overall rating" as just one star because of this. Sorry, Eaton. Unless I'm mistaken and the one unit is faulty, then you will need to release a revision 2.0 which includes proper cell protection. Ideally they would auto power-off at, say, 20% power remaining. Perhaps even make the percentage/voltage configurable with a DIP switch somewhere, but obviously a DIP switch would add slightly to the materials cost & the plastics would need redesigning, so a straightforward X% cut-off would be the most reasonable thing to implement.

This is brilliant - very easy to install. Very well made and good liking for what it is. Missing screw holes for wall mounting and the multi-adapter power connector can drop out of modem if it’s wall mounted vertically as it’s too fiddly (have had to tape the power connector into modem to keep it secure). But totally worth it and recommend despite niggles. The battery works great and powered modem for over an hour in testing.

Lasted 32 months then failed, so had two winters of power interruptions use - not bad for the money paid.

Having been provided with a new router by our internet provider, and also being migrated onto a voice over internet phone service, we decided that we needed a small UPS for the router in order to maintain phone and internet connectivity in the event of power cuts - we live in arural area and power cuts are a fact of life, even if they're not common. I did a fair bit of looking around to see what was available for what prices. I didn't want a cheap, no-name product, but I didn't want to spend the earth either. APC and Eaton seemed to be the best brands out there, and I'm familiar with the products of both companies. They are both "real" companies and supply products backed by proper warranties. In the end, the Eaton won out - largely because the connectors suited our router better (and it was also a bit cheaper). As it was, the 3.5mm barrel connector was still a little bit short and I had to machine away a small amount of the plastic surround to get a more secure connection - that's as much to do with the particular construction of our router, rather than being a fault of the UPS. That aside, it's a very neatly made package and is easy to set up and get running. I haven't yet tested the endurance of it to see how long it will keep the router running, but it does continue to run the router without any glitch or hesitation when I turn of the mains for a few minutes.

Had this as a backup power supply for my ONT, which is located away from my UPS powering everything else. It worked well, and did the job during a few power cuts for just over 2 years. Then recently, I noticed my internet was dropping every 3 or so hours, always at exactly 18 minutes past the hour. Eventually I traced it to the ONT, and after watching it during a drop I could see the ONT was powering off for a minute or so, before coming back on. When I unplugged the power from the Eaton 3S Mini, it immediately powered off. It's about a month outside the 2 year warranty, so yeah it's e-waste now. I don't plan to buy another one, I'll be using a PoE splitter instead because I can power the PoE from my main UPS.

These reviews are for different products. This one is for the Eaton 3S Mini. I had a similar Chinese device that I noticed the other day, when the power went off for a few minutes, wasn't working as intended. So I came to the Eaton device. It's stylish and looks good but leaves me puzzled, because I'm not sure that it's working as it should do. The switch is small, almost invisible, and needs tiny fingers, and mine aren't large by any means. I've connected it up to my 19v Asus router, which seems to be happy to be running at an indicated 12v. But how long will that last? There must be a reason that Asus thinks that its router needs 19v. I've tried changing the output to 19v, an 8s press followed by three 5s presses, but it seems to be 12v or nothing. I'm one of those people who often struggles with graphical instructions. There must be a knack to changing the output voltage and I haven't got it. I like the connector for the barrel plugs, by the way. Very well thought out.

Brilliant little UPS, Been using two for a while now and they have kept my devices running very smoothly during power breaks a few times now. The voltage selector allows complete flexibility if you want to use it with different devices, awesome.

It had clearly been removed from its packagung and then re inserted . The battery died upon first use. Great design but not much use.

The second chance ones have a high probability of damaged battery cells. I had to replace those,which is possible when you take it apart. But consider that it has no, again no, protection for deep discharging of the battwry cells inside. (2 x 18650)

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