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

Source: https://www.ranked10.co.uk/tech/best-ups-battery-backups
Published: 2026-09-18 | Updated: 2026-09-23 | Prices checked on Amazon UK on 2026-09-18

Shop for a UPS battery backup and the number that sells it is the VA rating: 550, 650, 850, 900, 1000, 1050 and 2200VA in this list alone. The watts you can actually pull are smaller — between 1.6 and 1.8 times smaller. The 2200VA PowerWalker is rated 1200W. The 900VA APC is 540W. The 1000VA BPC is 600W. The 550VA Eaton is 330W. Meanwhile the listings make the gap worse: one 650VA unit carries '1380 watts' in its wattage field, and a 2200VA unit shows '2200 Volts' under voltage. Work down to the watt figure in the spec table, and treat the big number in the title as marketing.

We ranked ten of the best UPS battery backup units on Amazon on what a buyer can actually verify: the watt figure in the spec table, the outlet count and type, the stated runtime, the review score, and how many people left that score. Two of the ten are the same 1000VA model listed twice, which tells you how repetitive this category is.

## The ranking

### 1. APC Back-UPS ES 850VA (BE850G2-UK)

- Price: £124.97 | Amazon rating: 4.4 from 1,084 ratings
- Full review: https://www.ranked10.co.uk/tech/best-ups-battery-backups/apc-back-ups-es-be850g2
- Buy on Amazon: https://www.amazon.co.uk/dp/B0828G42KN?tag=ranked10-21

Top of the list on evidence — 1,084 ratings at 4.4 — and the clearest case of why an 850VA UPS battery backup delivers 520W, not 850W.

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.

Pros: 1,084 ratings at 4.4 — the largest review base in this list; Six battery-backed outlets plus two surge-only, eight in total; USB Type A and Type C charging ports built in; 520W output wattage, against 390W from the 650VA model below; Dataline surge protection and a stated 3.5-year battery life
Cons: The spec table gives three power figures: 800W, 800W and 520W; 16-hour recharge time; the 1h 5m runtime has no load figure attached; 310 joules of surge protection is the same modest figure as the 1050VA model; No AVR claim anywhere in the listing, despite the price

### 2. APC Back-UPS 1050VA with AVR (BE1050G2-UK)

- Price: £153.55 | Amazon rating: 4.9 from 43 ratings
- Full review: https://www.ranked10.co.uk/tech/best-ups-battery-backups/apc-back-ups-be1050g2
- Buy on Amazon: https://www.amazon.co.uk/dp/B0DFQHLY79?tag=ranked10-21

The only unit here whose VA and watt figures agree at 600W, and the highest score in the list — on the thinnest sample.

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.

Pros: Every watt figure in the spec table agrees: 600W from a 1050VA label; Eight outlets, six battery-backed, plus USB Type A and Type C; User-replaceable battery and a 2-year warranty that includes the battery; Highest review score in this list at 4.9
Cons: Only 43 ratings, so the 4.9 rests on a small sample; £153.55 for 600W, against £99.99 for the same 600W from the BPC; The connected-equipment policy is limited to European Community countries; 36.5cm deep, so it needs a clear shelf or floor space

### 3. UGREEN NAS UPS 120W DC, 12000mAh

- Price: £99.98 | Amazon rating: 4.8 from 767 ratings
- Full review: https://www.ranked10.co.uk/tech/best-ups-battery-backups/ugreen-nas-ups-120w
- Buy on Amazon: https://www.amazon.co.uk/dp/B0DDC9ZK8R?tag=ranked10-21

A 4.8 from 767 ratings, but it is a direct-current box for NAS drives — not a mains uninterruptible power supply for a desk.

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.

Pros: 4.8 from 767 ratings; 12,000mAh battery with a stated 0-second transfer to battery; App monitoring plus automatic, orderly NAS shutdown and restart; 2-year warranty; 441g and compact at 20.5 x 13.5 x 3.7cm
Cons: 120W DC ceiling — NAS units and hard drives only; Not compatible with the DXP6800 or DXP8800 series; No BS1363 mains outlets; DC connector compatibility has to be checked against your NAS

### 4. APC Back-UPS Pro 900VA LCD (BR900MI)

- Price: £232.97 | Amazon rating: 4.4 from 198 ratings
- Full review: https://www.ranked10.co.uk/tech/best-ups-battery-backups/apc-back-ups-pro-br900mi
- Buy on Amazon: https://www.amazon.co.uk/dp/B07WJ3DT24?tag=ranked10-21

The 900VA label hides a 540W rating — and at £232.97 it is the most expensive mains unit here for barely more power than the £124.97 APC ES.

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.

Pros: AVR plus an LCD that reads out utility and UPS conditions; Six IEC battery-backed outlets with surge protection; 42-minute runtime claim — the longest stated here for a mains unit; Metal enclosure, 7kg, with RJ45 and telephone dataline protection
Cons: £232.97 for 540W — the worst pounds-per-watt among the mains units; The spec table repeats 900W twice against a 540W wattage field; IEC outlets, not BS1363 — you may need new cables; 4.4 from 198 ratings, including five 1-star reviews

### 5. PowerWalker VI 2200VA / 1200W LCD

- Price: £179.99 | Amazon rating: 4.1 from 229 ratings
- Full review: https://www.ranked10.co.uk/tech/best-ups-battery-backups/powerwalker-2200va-1200w-ups
- Buy on Amazon: https://www.amazon.co.uk/dp/B00O636RRC?tag=ranked10-21

The most watts for the money — 1200W for £179.99 — on the lowest score in the top five and a spec sheet that contradicts itself twice.

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.

Pros: 1200W output for £179.99 — the lowest cost per watt in this list; Six IEC C13 outlets with RJ11/RJ45 surge protection; Boost and buck AVR, cold start and HID-compliant USB monitoring; LCD status display
Cons: 4.1 from 229 ratings; 16% of those ratings are 1 or 2 stars; 'Voltage: 2200 Volts' and 'Runtime: 0 minute' sit in the spec table; Two different dimension sets given in the same listing; IEC outlets only, no BS1363 sockets

### 6. Eaton 3S Gen2 550VA / 330W (3S550B)

- Price: £55.84 | Amazon rating: 4.2 from 80 ratings
- Full review: https://www.ranked10.co.uk/tech/best-ups-battery-backups/eaton-3s-gen2-3s550b
- Buy on Amazon: https://www.amazon.co.uk/dp/B0B3RS2986?tag=ranked10-21

The cheapest way in at £55.84, and the one that states its watts plainly — 550VA, 330W, 10 minutes — but only three of six sockets stay live.

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.

Pros: £55.84 — the lowest price in this list; 550VA and 330W stated consistently across every power field; Six BS outlets: three battery-backed, three surge-only; 2-year standard warranty and a USB HID port for automatic OS integration
Cons: Only three outlets survive a power cut; 330W ceiling rules out most gaming PCs; 10-minute runtime, with no recharge time given; Ships with two IEC cords rather than BS leads

### 7. SKE Mini UPS 20000mAh for Router and Modem

- Price: £66.49 | Amazon rating: 4.4 from 351 ratings
- Full review: https://www.ranked10.co.uk/tech/best-ups-battery-backups/ske-mini-ups-20000mah
- Buy on Amazon: https://www.amazon.co.uk/dp/B0CQR5GMN4?tag=ranked10-21

Seven hours for a 20W router and modem on a 20,000mAh battery — but this is a DC power bank with sockets, not a mains UPS.

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.

Pros: Up to 7 hours for a 20W router and modem on 20,000mAh; Five outputs: USB 5V/2A plus DC 5V/3A, 9V/2A and 12V/3A; Automatic voltage regulation and a battery-level indicator; 0.65kg and 20.6 x 12 x 3.5cm — genuinely portable
Cons: 20W maximum output — routers, modems and phones only; No BS1363 mains sockets; 'Type A - 2 pin (North American)' plug type on a UK-titled listing; DC barrel size must match your router

### 8. BPC PO1000 1000VA / 600W UPS

- Price: £99.99 | Amazon rating: 4.0 from 58 ratings
- Full review: https://www.ranked10.co.uk/tech/best-ups-battery-backups/bpc-po1000-1000va-ups
- Buy on Amazon: https://www.amazon.co.uk/dp/B0DFYZVRZ5?tag=ranked10-21

A 1000VA unit with 600W, eight surge-protected outlets and two USB sockets for £99.99 — with the highest one-star share in this ranking.

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.

Pros: 600W from a 1000VA label, for £99.99; Eight surge-protected outlets, two USB sockets; 6-hour recharge time; £53.56 less than the 1050VA APC for the same 600W
Cons: Largest one- and two-star share in this guide; 4.0 from 58 ratings, with 13 one-star reviews; No AVR; Runtime figures disagree: 20 minutes in one field, 10 in another

### 9. APC Back-UPS ES 650VA (BE650G2-UK)

- Price: £107.43 | Amazon rating: 4.5 from 112 ratings
- Full review: https://www.ranked10.co.uk/tech/best-ups-battery-backups/apc-back-ups-es-650va
- Buy on Amazon: https://www.amazon.co.uk/dp/B0828FD5KX?tag=ranked10-21

The '1380 watts' listing: a 650VA unit with a 390W output wattage and a 2-minute runtime — right for a router and small PC, wrong for anything bigger.

This is the listing that best shows why the title number cannot be trusted. The model is a 650VA UPS. 'Maximum Power' reads 650 Watts, 'Output Wattage' reads 390 Watts, and 'Wattage' reads 1380 watts — nearly double the VA rating and more than three times the output figure. Only the 390W number is plausible for a 650VA desktop unit.

By contrast with the 850VA APC above, the hardware is the same shape: eight outlets, six battery-backed and two surge-only, one USB Type A charging port, dataline surge protection and a 16-hour recharge. The runtime fields are the honest part: 'Runtime: 2 minutes' and 'Battery Average Life: 2.6 minutes'. That is a ride-through long enough to shut down, not a working session.

As a result, buy it for a router, a modem and a small desktop — not for a workstation. And check the price gap: £107.43 here against £124.97 for the 850VA model, which gives you 130W more output for £17.54. Unless space or budget is tight, the larger one is the better buy.

Pros: 390W output from a 650VA label; Eight outlets, six of them with battery backup; USB Type A charging port and dataline surge protection; £107.43 — £17.54 less than the 850VA model
Cons: 'Wattage: 1380 watts' is more than three times the output wattage; 2-minute runtime and 2.6-minute battery life fields; 390W rules out a gaming desktop; Only 112 ratings, and one USB Type A port rather than the 850VA model's Type A and C

## Verdict

For most homes, the 850VA APC at £124.97 is the sensible UPS battery backup: 1,084 ratings, eight outlets and 520W for a desktop, monitor and router. If you need to keep a NAS and its drives alive, the 120W UGREEN DC unit does that specific job for £99.98 and 767 ratings. For a router and modem on a tight budget, the Eaton at £55.84 is the cheapest UPS battery backup here — 330W, and three of its six sockets keep running in a cut. Crucially, none of that changes the rule: read the watt figure, not the VA in the title. A 2200VA label that shows '2200 Volts' under voltage, or a 650VA unit showing '1380 watts', tells you the listing was filled in carelessly. Either way, match watts to your load, then buy.