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

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.

This looked promising to provide backup power to an internet router - small size, felt solid, and worked as expected first time out the box. Thing about a UPS - you only know it's failed when you need it. Fast forward a year and when we had electrical work done, mains was turned off and internet died. Same shortly afterwards when we had a tiny power blip. Pressing the button to check the internal battery charge showed it was at less than 5%. So at some point in past year the battery's completely deteriorated.Rang Eaton support line twice. Went to voicemail both times - "all our agents are busy", which is fair enough but no one's rung me back. When reporting to Amazon they experienced the same thing! Amazon sorted a return and refund, of course, but nothing positive to say about Eaton.

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.

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 2024Another 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

We regularly suffer from short power cuts and brown outs in this area which can corrupt modems and lock out connected devices. This UPS removes any glitches from the mains and provides continuous power to small devices like modems, routers, cameras etc.Up to now, I have installed two of these UPS to power modems and have achieved 24/7 operation with no connection problems for several months now. Even during power cuts, portable devices like laptops and iPads stay connected to the internet and continue to work.As mentioned by others, the option to wall mount would be helpful but it is easy to improvise an alternative way to fix on a wall.After using this UPS 24/7 for two years I happened to switch off the mains supply and discovered the unit was not acting as a UPS but as a simple power supply. I opened the unit up and replaced the two batteries with a new pair of flat top Samsung 25R 18650 batteries and the UPS worked fine.Changing the batteries is quite simple but comes with the usual warnings about voiding any warranty and the fire risk from not using suitable Li ion batteries.The procedure is as follows:Disconnect unit from mains and devices.Prise off the four rubber feet.Use torx screwdriver to remove screws, there is a yellow tamper indicator over one screw.Pull PSU apart to reveal batteries.Swap batteries noting polarity. The photo shows new batteries.Put PSU back together.Plug in mains and recharge batteries to give a repaired PSU at the fraction of the cost of a new unit.As mentioned earlier, I bought two of these PSU and both failed because of faulty batteries. I'm hoping that a good brand like Samsung will give a longer battery life compared to the original TenPower batteries. Knocked 2 stars off for poor battery life.

Initially it seemed to do its job protecting our broadband modem and kept the broadband running when short power failures occurred. However after 15 months the broadband kept on going down when we had short power failures. I then saw that only one of the green lights was showing and however long the item was left on it did not charge. It would seem that the battery has died. After a few months with no protection I tried to call Eaton on the number provided and even though I tried a few times could not get anyone to answer the phone and when I tried to leave a message for a call back the line cut off. Eaton obviously are not interested in any Customer Service. I will never purchase another Eaton product.

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.

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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