Best UPS Battery Backup 2026: 9 Ranked, and Why 2200VA Isn't 2200W

This tops the list on volume of evidence: 1,084 ratings averaging 4.4, more than any other mains unit here. It is also the clearest illustration of the label problem. The title says 850VA; the spec table lists 'Maximum Power: 800 Watts' and 'Wattage: 800 watts', then contradicts both with an output wattage of 520. Only one of those can be the real ceiling, and it is the 520W figure. In theory an 850VA UPS battery backup can deliver far less than 850W, because VA is not watts; the realistic output here is 520W.

In practice the eight outlets split six battery-backed and two surge-only, and two USB ports (Type A and Type C) charge phones off the same box. The surge rating is 310 joules, which is modest, the battery takes 16 hours to recharge from flat, and APC quotes 3.5 years of average battery life. Dataline surge protection covers whatever runs along your phone or network cable. One listing oddity: 'Power Plug Type: No Plug', on a model number that ends -UK.

Do not buy it to run a 750W gaming rig — 520W is the ceiling, and a PC drawing near that gets seconds, not the '1 hour and 5 minutes' in the runtime field. That runtime is not tied to any stated load. If you need IEC outlets, an LCD or AVR, this is not the one.

This is the tidy one: 1050VA, and 600W in every field that mentions watts — 'Maximum Power: 600 Watts', 'Output Wattage: 600 Watts', 'Wattage: 600 watts'. No contradictions, no 1380-watt surprises. Meanwhile it holds the highest rating here at 4.9, though from only 43 reviews, against 1,084 for the 850VA model. A 4.9 from 43 people is a weaker signal than 4.4 from 1,084.

It is the home office UPS with AVR in this line-up: automatic voltage regulation corrects brownouts and overvoltage without draining the battery, which matters if your supply dips through the working day. Eight outlets, six of them battery-backed; two USB ports, Type A and Type C; a user-replaceable battery; and a 2-year warranty that covers the battery as well as the unit. However, the £150,000 connected-equipment policy is limited to European Community countries.

The catch is price per watt. The 1000VA BPC unit further down also delivers 600W, for £99.99 against £153.55 here. What you pay the extra for is AVR, the replaceable battery, the warranty and the brand — not more power. If your mains is steady and you simply want a UPS battery backup for a desktop, the cheaper 600W unit does the same job on paper.

Different animal, strong score: 4.8 from 767 ratings. Its ceiling is 120W of DC output and a 12,000mAh battery, delivered over ATX-type connectors to a NAS. That is a fixed 120W, not 1200W, and it will not run a monitor, a printer or a desktop.

In practice the sell is the transfer time and the software. The listing states a 0-second switch to battery, and the UGREEN app monitors battery state, shuts the NAS down in order when power fails, and restarts it when mains returns. Compatibility is listed explicitly — DXP2800/DXP2800GT, DXP4800 Pro/GT/Plus, DXP480T Plus, DH2300 and DH4300 Plus — with the DXP6800 and DXP8800 series excluded in the first bullet. It weighs 441g, so it can sit on top of the unit it protects.

Do not buy this if you need sockets. Do not buy it if you want a battery backup for PC, monitor or router either — there are no BS1363 outlets here and the output is capped at 120W. And if you own a DXP6800 or DXP8800, the listing rules it out in its own first line.

Here the title says 900VA and the spec table answers three ways: 'Maximum Power: 900 Watts', 'Output Wattage: 900', and then 'Wattage: 540 watts'. The 540W is the number that matters. This is the VA vs watts UPS trap in its purest form — the model name, the maximum-power field and the output-wattage field all echo the VA figure, while the wattage field gives the real one.

What the money buys is regulation and information. AVR corrects voltage fluctuations so brownouts do not push you onto battery; the LCD reports utility and UPS conditions; six IEC outlets are battery-backed, so if your kit uses kettle leads this is a plug-and-play UPS with surge protection. There is RJ45 and telephone dataline protection, a 12-hour recharge and a stated 42-minute runtime, in a 7kg metal case.

The catch is value. £232.97 for 540W against £124.97 for 520W on the 850VA APC ES — that is £108 more for 20W. If you are not going to use the AVR, the LCD or the IEC wiring, you are paying for features you will not touch. Worth noting too: 'Power Plug Type: No Plug' appears again, on a unit that obviously needs one.

In watts per pound this wins outright: 1200W for £179.99, against 600W for £153.55 on the APC 1050VA. The title states both numbers honestly. The rest of the listing does not. 'Voltage: 2200 Volts' is the VA figure pasted into a voltage field, which is meaningless on a 230V supply. 'Runtime: 0 minute' says nothing. 'Output Current: 0.55 Amps' cannot be right for 1200W at 230V — that would be roughly 5.2A.

At the same time there is a lot of hardware here: six IEC C13 outlets, boost and buck AVR, RJ11/RJ45 surge protection, USB monitoring with HID support, cold start, and an LCD for status. It weighs 10.2kg and stands 19.5cm tall by 36.4cm deep. The dimensions are given twice as well — once as 36.4 x 13.9 x 19.5cm and once as '28 x 246 x 165 millimetres' — and those do not describe the same box.

Even so, 4.1 is the weakest score in this top five, and 16 of its 100 ratings sit at one or two stars. If you need a genuine 1200W UPS battery backup load — a workstation, a rack of small kit — this is the cheapest way to get there. If you want quiet reliability on a simple desk set-up, the higher-rated APC units are the safer bet.

Cheapest unit here at £55.84, and the tidiest labelling of the mains models: 550VA and 330W in the title, 330W repeated in the wattage, maximum-power and output-wattage fields, and a 10-minute standard runtime. No 1380-watt confusion, no 2200-volt voltage field.

The trade is raw capacity and outlet count. Six BS outlets, but only three are battery-backed — the other three are surge-only, so you cannot keep a PC, a monitor, a router and a printer alive on battery at once. 330W is enough for a monitor, a router and a modest desktop; it is a sensible UPS for router and modem duty, or for one desktop drawing under 300W.

That said, the extras are thin. No AVR is claimed, no recharge time is given, and the box ships with two IEC output cords despite BS outlets. One odd spec line reads 'Lower Temperature Rating: 40 Degrees Celsius', which looks like an upper limit filed in the wrong place. If you need more than 330W, or more than three backed-up sockets, move up the list.

Read the numbers before the title. Maximum power is 20W and output wattage is 20W — this is sized for a router and modem drawing about 20W, which the listing says it will run for up to seven hours on 20,000mAh. Set against the 520W, 600W and 1200W units above, it is a different category altogether.

In practice it does one job well: keep the broadband alive. Five ports cover USB at 5V/2A and DC at 5V/3A, 9V/2A and 12V/3A, so the barrel connector has to match your router — check before buying. It also offers automatic voltage regulation, a battery-level indicator, and at 0.65kg and 20.6 x 12 x 3.5cm it can move between rooms or go in a bag.

Here is the contradiction worth flagging: the listing is titled for the UK and aimed at UK routers, yet its 'Power Plug Type' field reads 'Type A - 2 pin (North American)'. Check what is in the box, and check the DC plug size against your router, before you rely on it. And do not buy it for a PC — 20W will not start one.

The numbers are simple: 1000VA and 600W, eight surge-protected outlets, two USB sockets, a 6-hour recharge and a 10-minute runtime for £99.99. That puts it in the same class as the 1050VA APC on watts, for £53.56 less, which is the reason it is in this ranking at all.

What it does not have is AVR. At this price that is the specification to weigh, because voltage correction is the difference between riding out a brownout and switching to battery every time the supply dips. Weigh it against the 600W APC at £153.55 on AVR, warranty and battery replacement rather than on VA.

The reason not to buy is the feedback. At 4.0 from 58 ratings it carries the largest one- and two-star share in this guide, and its runtime figures disagree with each other: 20 minutes in one field, 10 in another.