Best Computer Uninterruptible Power Supply Units Under $100 (2026)
We selected units under $100 using a value score that weights VA/watt capacity, outlet and USB features, surge protection, battery replacement compatibility, and user-reported reliability
The Verdict
- Best Overall: APC BE600M1 Back-UPS 600VA 330W with USB Charger — Best backup for compact desktops: reliable 600VA/330W backup with USB charging and dedicated protected outlets
- Best Value: APCRBC154 replacement battery for APC UPS BE600M1 BN650M1 BN675M1 BE670M1 — Best budget compatible battery: lower-cost replacement battery compatible with several APC BE-series models
This roundup covers computer uninterruptible power supply (UPS) units and compatible replacement batteries under $100, chosen for reliable backup capacity, surge protection, and overall value. Selections were ranked by a value score that balances output wattage/VA, outlet count, USB charging, and user-reported longevity
Top Picks
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1
Best Overall APC BE600M1 Back-UPS 600VA 330W with USB Charger
Best backup for compact desktops: reliable 600VA/330W backup with USB charging and dedicated protected outlets
Compact UPS with 600VA/330W battery backup, 7 outlets incl. battery-backed and surge-protected, plus a USB charging port. Customers note reliable power and easy setup, with mixed opinions on battery life during outages
- 600VA/330W capacity
- 7 outlets including battery backup
- USB charging port
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2
APC RBC123 replacement battery for select APC UPS models
Best for maintenance: direct replacement battery for multiple APC models to restore original runtime and reliability
APC RBC123 replacement battery cartridge restores original UPS performance. Compatible with BR1000G, BX1350M, BN1350G, BX1000G, BX1300G and select models. Customers report easy installation and good value with near-full charge on arrival
- compatible with multiple APC UPS models
- easy to install
- near-full charge upon arrival
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3
CyberPower 425VA Standby UPS with 8 outlets
Best basic standby UPS: compact 425VA unit with eight outlets for protecting a small home office setup
Compact standby UPS with 425VA/260W capacity and 8 outlets for computers, gaming consoles, and routers. customers note good value and compact size, with some reports of loud continuous beeping
- 425VA/260W standby UPS
- 8 NEMA 5-15R outlets
- LED power-on and wiring fault indicator
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4
APC RBC17 Replacement Battery for select APC UPS models
Best replacement battery option: compatible APC battery that restores UPS runtime for supported units
Replacement battery cartridge for APC UPS models, restoring performance to original specifications. Customers find it fits well, easy to install, and a solid value, though charging performance varies by unit
- genuine APC replacement battery
- compatible with several APC UPS models
- restores original UPS performance
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5
APC RBC Replacement Battery for UPS Models
Best multi-model battery choice: replacement battery that fits several APC UPS models for straightforward upkeep
APC Replacement Battery Cartridge (RBC) compatible with select APC UPS models. Restores original performance and is pre-charged for immediate use. Customers note easy installation and good fit, with value for money; some report variable battery life
- compatible with multiple APC UPS models
- pre-charged and ready to install
- certified compatibility to original specifications
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6
APC 425VA UPS Battery Backup Surge Protector BE425M
Best low-profile backup: 425VA unit offering simple battery backup and surge protection for modest PC setups
Compact UPS with 425VA/225W battery backup and surge protection. Includes 6 outlets, 5' power cord, and wall-mount option; battery not user-replaceable but serviceable. One customer insight notes mixed battery life and alarm volume
- 425VA/225W battery backup
- 6 outlets with mixed backup and surge
- wall-mountable, 5' cord
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7
CyberPower 700VA/370W Standby UPS with 8 outlets
Best higher-capacity standby option: 700VA/370W unit for longer runtime and more robust backup headroom
Compact standby UPS with 8 outlets for computers, gaming consoles, and routers. Delivers simulated sine wave protection for short outages. Customers note good functionality and value, though battery life and alarm beeping are concerns
- 8 outlets including backup and surge protected
- slim profile footprint
- wide-plug outlet spacing
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8
CyberPower 625VA Standby UPS with 8 outlets, USB charging
Best mid-range compact UPS: 625VA unit with USB charging and multiple outlets for small to medium setups
Compact standby UPS with 8 outlets and 2 USB charging ports protects computers, gaming consoles, and routers with simulated sine wave output. Customers note compact size and functionality, though battery life and alarm beeps receive mixed feedback
- 625VA/360W capacity
- 8 NEMA 5-15R outlets
- 2 USB charging ports
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9
Best Value APCRBC154 replacement battery for APC UPS BE600M1 BN650M1 BN675M1 BE670M1
Best budget compatible battery: lower-cost replacement battery compatible with several APC BE-series models
Direct replacement battery for APC RBC154/ APCRBC154. Compatible with UPS models BE600M1, BN650M1, BN675M1, BE670M1. Customer insight suggests reliable performance
- Direct compatibility with RBC154
- APC UPS replacement battery
- Compatible with multiple BE/BN model numbers
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10
Mini UPS Battery Backup 10400mAh 38.48Wh with 4 ports
Best portable mini UPS: compact 10,400mAh unit with multiple ports for mobile devices and small home-security gear
Compact UPS with four output ports (9V/2A, 12V/2A, 12V/2A, USB 5V/2A) and a 10400mAh, 38.48Wh battery. Provides power to routers, cameras, and phones; features battery level indicators. Customers note solid battery life and reliable performance for home use
- 4 output ports including USB
- high-capacity 10400mAh battery
- compact portable design