Best Computer Uninterruptible Power Supply Units Under $100 (2026)
We ranked units by a value score combining VA/W capacity, outlet/USB features, replacement battery availability, brand reliability, and recent user feedback
The Verdict
- Best Overall: APC BE600M1 Back-UPS 600VA 330W with USB Charger — Best for general desktop protection: reliable 600VA capacity with USB charging and multiple protected outlets
- Best Value: APCRBC154 replacement battery for APC UPS BE600M1 BN650M1 BN675M1 BE670M1 — Best third-party battery replacement: lower-cost compatible battery designed for common APC BE600M1-series units
This roundup covers compact computer uninterruptible power supply (UPS) units and compatible replacement batteries priced under $100, focused on models that balance backup runtime, surge protection, and outlet count. Selections prioritize value score derived from capacity (VA/W), outlet and USB provisioning, brand reliability, and recent user feedback
Top Picks
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1
Best Overall APC BE600M1 Back-UPS 600VA 330W with USB Charger
Best for general desktop protection: reliable 600VA capacity with USB charging and multiple 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 replacement battery option: direct OEM cartridge to restore UPS runtime and compatibility with select APC models
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 compact standby UPS: small 425VA unit offering basic battery backup and multiple outlets for home setups
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 legacy battery replacement: compatible OEM battery cartridge to maintain older APC UPS units' uptime
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 425VA UPS Battery Backup Surge Protector BE425M
Best budget surge-plus-backup: 425VA backup with surge protection for essential desktop and networking gear
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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6
CyberPower 700VA/370W Standby UPS with 8 outlets
Best higher-capacity standby unit: 700VA platform that provides extra runtime headroom for modest loads
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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7
CyberPower 625VA Standby UPS with 8 outlets, USB charging
Best mid-range compact UPS: 625VA capacity in a space-saving design with USB charging for peripherals
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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8
Best Value APCRBC154 replacement battery for APC UPS BE600M1 BN650M1 BN675M1 BE670M1
Best third-party battery replacement: lower-cost compatible battery designed for common APC BE600M1-series units
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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9
Mini UPS Battery Backup 10400mAh 38.48Wh with 4 ports
Best mini portable backup: 10,400mAh unit that supplies short-duration power and multiple ports for small devices
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
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10
APC RBC2 Replacement Battery Cartridge for BE500R and more
Best alternative OEM battery cartridge: replacement battery for legacy APC models to restore original runtime
Replacement battery cartridge for APC UPS units, restoring original performance with genuine APC support. Customers note easy installation and reliable compatibility, though battery life varies by usage
- compatible with multiple APC models
- restores original UPS performance
- easy installation