For a router alone, a low-voltage DC UPS is usually quieter and more efficient than converting battery power back to 230V. Its voltage, polarity, barrel size and available current must match the router exactly, however. Remember to back up a separate fibre ONT or modem as well, because working Wi-Fi does not guarantee an internet connection. A mains UPS is easier when several original power adapters must remain connected. Compare runtime at the actual load, outlet format, noise and replacement-battery availability. Our backup battery runtime calculator and home backup power guide provide further help. For prices and ordering, click on the product image.
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Best UPS Battery Backups for Routers – our recommendations
PowerWalker VI 650 SHL IEC UK
This compact line-interactive UPS provides 650VA and 360W capacity, which is ample for a typical router, fibre ONT and small network switch. Its four IEC C13 outputs are joined by automatic voltage regulation, an LCD status screen, RJ-11 surge protection and USB HID monitoring. The stronger charging system can restore most of the battery capacity within a few hours. Most domestic router adaptors have UK plugs, so an appropriate IEC-to-UK socket lead will normally be required. Runtime still depends on the actual connected load and battery condition.
PowerWalker VI 850 SHL IEC UK
The 850 SHL increases capacity to 850VA and 480W while retaining four IEC C13 outputs, an LCD display, automatic voltage regulation and USB HID support. It is a sensible step up when the backup must run a router, ONT, Ethernet switch and another low-power network device. The simulated sine-wave output is suitable for ordinary networking equipment but may not suit every sensitive power supply. Its IEC sockets also mean that standard UK-plug adaptors cannot be connected directly without suitable IEC-to-UK leads.PowerWalker VI 1200 IEC
This 1200VA, 600W model offers considerably more headroom than a router alone requires. Its six IEC C13 outputs make it useful for a larger network containing an ONT, router, managed switch, access points and a modest NAS. Automatic voltage regulation can correct some mains fluctuations without using the battery, while USB HID support allows compatible computers or storage devices to monitor the UPS. It produces a simulated sine wave and lacks ordinary UK output sockets, so check equipment compatibility and obtain the correct IEC leads before ordering.
SKE Mini UPS 10400mAh
SKE combines a 10,400mAh lithium battery with USB 5V, DC 9V and two DC 12V outputs. That arrangement can support a router and compatible ONT without the bulk of an AC UPS, while the two supplied conversion cables cover several common barrel connectors. The headline number of outputs does not mean each can deliver its maximum simultaneously, so calculate the combined load carefully. Documentation is less detailed than it is for APC or Tecnoware, making a thorough voltage, polarity and connector check especially important before connecting valuable network equipment.
PowerWalker Basic VI 850 SB UK
The Basic VI 850 SB UK is particularly convenient for domestic networking equipment because its two Type G outlets accept normal UK plugs directly. Its 850VA and 480W rating provides comfortable overhead for a router, ONT and another small device. Boost and buck automatic voltage regulation helps handle moderate voltage changes, while USB HID communication supports monitoring from a compatible computer. It has simple status indicators rather than an LCD, and its simulated sine-wave output means it should not be bought for equipment that specifically requires a pure sine wave.
PowerWalker Basic VI 1000 SB UK
This 1000VA, 600W Basic VI model provides three UK sockets, making it easier to connect ordinary router, ONT and switch power supplies without output adaptors. It includes automatic voltage regulation, cold-start capability and USB HID monitoring but uses straightforward indicators rather than an LCD. The additional capacity is useful for a larger home network or a small NAS, although a higher VA rating does not guarantee a particular runtime. As this is a simulated sine-wave UPS, confirm compatibility before connecting unusually sensitive equipment or active power-factor-correction supplies.
CyberPower BR700ELCD-UK
CyberPower’s BR700ELCD-UK has six British sockets, avoiding the additional leads required by an IEC-only UPS. Three sockets receive battery and surge protection, while three are surge-only, so the router, ONT and telephone base should use the battery-backed group. Its 700VA and 420W rating is ample for typical communications equipment, and the LCD provides clearer status information than simple warning lights. Automatic voltage regulation handles moderate fluctuations without draining the battery. The simulated sine-wave output is acceptable for ordinary network adapters but less suitable for sensitive high-power equipment.
SKE 850VA 480W UK UPS
This SKE is a flexible UK-socket model with an 850VA and 480W rating, five battery-backed sockets, two USB-A ports and one USB-C connection. Its LCD reports input voltage, output voltage, battery level and connected load, while automatic voltage regulation helps preserve the battery during less serious supply disturbances. The battery is designed to be replaceable with basic tools. The specification is attractive for the cost, although the brand has a shorter UK track record than APC or CyberPower. Leave ventilation space and test the switchover before relying on it.
PowerWalker Basic VI 650 SB UK
PowerWalker’s 650VA model is a compact and relatively inexpensive way to keep two UK-plugged devices operating. Its two BS 1363 sockets suit a router and separate fibre ONT, while automatic voltage regulation, cold start and USB HID communication add functions normally associated with larger units. The sealed lead-acid battery is rated at 5Ah and the design has no cooling fan. There is no LCD, and the manufacturer gives only 4.5 minutes at half load. A small network load should last longer, but it needs to be tested rather than assumed.PowerWalker Basic VI 800 STL LCD UK
This 800VA PowerWalker adds a useful LCD to a fanless, UK-socket design. Three BS 1363 outputs provide room for a router, ONT and another low-power network device, while its 480W ceiling leaves ample load capacity. The screen can be dimmed, the alarm can be muted and USB HID support allows monitoring from a compatible computer. Its 7.2Ah sealed lead-acid battery is replaceable, although PowerWalker specifies only five minutes at half load. Router runtime will differ substantially because a network setup draws far less than 240W.
PowerWalker Basic VI 1000 STL LCD UK
The 1000 STL is the more capable version for a router accompanied by a larger switch, NAS or surveillance recorder. It supplies 1000VA or 600W through three British sockets and uses a 9Ah sealed lead-acid battery. The LCD, automatic voltage regulation, cold start, USB monitoring and fanless operation make it well suited to a home network cupboard. Maximum wattage should not be confused with stored energy, and PowerWalker quotes 5.5 minutes at half load. Measuring the actual network draw gives a much more meaningful runtime estimate.APC Back-UPS BX500MI
The BX500MI is the smallest conventional APC tower in this selection. Its 500VA and 300W rating is more than enough for a router, ONT and basic switch, while automatic voltage regulation helps handle low or high input voltage without needless battery use. It has three IEC C13 outputs rather than British sockets. A router adapter with a detachable IEC C7 or C5 input may accept an appropriate C14 lead; otherwise a correctly rated C14-to-UK socket lead is needed. Do not stack travel adapters or assume an IEC lead is supplied.
APC Back-UPS BX750MI
The BX750MI raises capacity to 750VA and 410W and provides four IEC C13 outputs. It is a sensible choice when the network includes a router, ONT, managed switch and one additional device, provided suitable IEC leads are available. Automatic voltage regulation, data-line surge protection and USB communication broaden its role beyond simple blackout backup. The front uses status LEDs rather than an LCD, so runtime information is less detailed. As with other sealed lead-acid systems, expect capacity to decline with age and budget for a future replacement battery.
APC Back-UPS BX950MI
Six IEC C13 outputs make the 950VA BX useful for a busier network cupboard. Its 520W maximum supports substantially more than a normal router setup, so the main benefit is connection flexibility for a switch, controller, NAS or surveillance equipment. Automatic voltage regulation reduces unnecessary battery switching, and USB communication can support an orderly computer or NAS shutdown when correctly configured. It is bulky for backing up one router and does not accept a normal UK plug directly. Include the cost and arrangement of suitable IEC leads when comparing it with UK-socket alternatives.
APC Back-UPS BX1200MI
The BX1200MI offers 1200VA, 650W and six IEC C13 outputs. That specification is excessive for a router alone but appropriate when internet access depends on a router, optical terminal, PoE switch, controller and NAS remaining available together. Automatic voltage regulation and network data-line protection address problems beyond complete blackouts, while USB communication allows compatible equipment to monitor the UPS. Larger load capacity does not automatically mean exceptional low-load runtime because inverter overhead still consumes energy. Confirm that every connected power adapter has an appropriate IEC lead before installation.
APC Back-UPS BX1600MI
At 1600VA and 900W, this BX is aimed at a substantial home-office or network setup rather than one broadband router. Six IEC C13 outputs can cover an ONT, router, PoE switch, NAS and home server, with automatic voltage regulation and USB monitoring included. The larger battery and power electronics add weight, cost and standby consumption, so a DC mini UPS remains more rational for a single 10W device. Choose this model when several pieces of equipment genuinely need uninterrupted 230V power and verify the replacement-battery cost before purchase.
APC Easy UPS BVX700LI
The BVX700LI is a straightforward 700VA and 360W line-interactive UPS with IEC C13 outputs. It includes automatic voltage regulation, cold start and LED status indicators, making it suitable for a router, fibre terminal and small switch where detailed computer management is not essential. Its simpler specification can be an advantage in an emergency cupboard, but it still requires compatible IEC leads rather than ordinary British plugs. The sealed lead-acid battery will require periodic testing and eventual replacement. Test the complete network under battery power after installation, including any cordless telephone base.
APC Easy UPS BVX900LI
The 900VA BVX provides 480W of load capacity and four IEC C13 outlets. It suits a modest home network with several low-power devices and offers automatic voltage regulation, cold start and a user-replaceable battery. Status is communicated through LEDs and audible alarms rather than a detailed LCD. Its capacity is ample for networking equipment, but the likely runtime still depends on total watts, battery age and conversion losses. Use correctly rated IEC leads, keep the ventilation openings clear and record the installation date so battery tests are not forgotten.
PowerWalker VI 2200 IEC
The VI 2200 is intended for a much larger network installation rather than a router by itself. Its 2200VA and 1200W capacity can accommodate several network devices, a NAS and other compatible equipment, while six IEC C13 outputs provide plenty of connections. Automatic voltage regulation, USB HID monitoring and data-line surge protection are included. The extra battery capacity also brings considerably greater size and weight, and the simulated sine-wave output is not appropriate for every load. Ordinary UK plugs require suitable IEC-to-UK output leads.APC Easy UPS BVX1600LI
The BVX1600LI is the largest Easy UPS included here, rated at 1600VA and 900W. It is intended for a combined network and computing load rather than an isolated router, with IEC C13 outputs, automatic voltage regulation, cold start and a replaceable battery. The extra output capacity can accommodate a NAS or small server, but it does not guarantee proportionally longer runtime at very low loads. This is also a comparatively heavy installation. Provide ventilation, use appropriate IEC leads and confirm that the alarm and battery self-test remain accessible after positioning it.
UPS Battery Backup Resources
- Backup battery runtime calculator – Estimate runtime from battery energy, connected load and expected conversion losses.
- Backup power for a UK home – Compare UPS units, power stations and other household backup options.
- Best power banks for power cuts – Portable USB options for phones, tablets, USB lights and compatible network equipment.
- Ofcom digital landline guidance – Explains why digital landlines need backup power and when providers must offer support.
- National Grid power-cut preparation tips – Practical advice for preparing a household before an interruption.
- Electrical Safety First socket guidance – Advice about extension leads, socket loading and avoiding daisy chaining.
- UK product safety alerts, reports and recalls – Search the official database before buying or continuing to use electrical equipment.
- GOV.UK battery and electrical recycling guidance – Information about disposing of worn UPS batteries and electrical equipment correctly.
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