APC Back-UPS XS XS800 Replacement UPS Batteries - Set of 2 - Reliable

In this review of the APC Back-UPS XS XS800 replacement batteries, the bottom line is straightforward: this set of two genuine Beiter DC Power sealed lead acid batteries is for anyone who needs a dependable, maintenance-free swap for an aging UPS battery pack. The reviewer found the pair especially appealing for home offices and small server closets because the batteries use a valve regulated, spill-proof design and a high impact ABS case that tolerates vibration and heat. If uninterrupted runtime and safe, orientation-free replacement matter, these batteries deliver.

Key Features

• Genuine Beiter DC Power: Provides a direct replacement identity so compatibility with APC Back-UPS XS XS800 style units is straightforward and predictable.
• 20 hour sealed lead acid battery: Designed for long, steady discharge testing and real-world UPS load profiles where predictable capacity matters.
• Maintenance free and valve regulated: The sealed, VRLA design eliminates topping off and reduces maintenance effort while keeping the battery safe in indoor equipment racks.
• Rugged ABS case: The high impact, non-conductive plastic case resists shock, vibration, chemicals and heat to protect internal cells in tighter equipment spaces.
• Spill-proof fiberglass mat: The fine fiberglass mat and valve regulation allow safe operation in any orientation, simplifying installation in confined UPS cavities.

Who It's For

This set is best for homeowners, small business owners, and IT hobbyists who need a like-for-like replacement for an APC Back-UPS XS XS800 style UPS and want a maintenance-free, sealed solution. It also suits anyone who values rugged construction and safe, spill-proof batteries that can be mounted or stored in constrained spaces.

Those who should look elsewhere include users seeking lithium-based replacements for much lighter weight or significantly greater cycle life, or professional data centers that require vendor-branded service contracts and enterprise lifecycle reporting. This product is focused on compatibility, safety and value rather than premium chemistry.

Pros & Cons

Pros

• Genuine Beiter DC Power construction delivers expected compatibility and dependable performance as a UPS replacement.
• Maintenance-free, valve regulated design removes the need for periodic service and allows flexible mounting orientation.
• Durable, high impact ABS case protects the battery in environments with vibration or occasional knocks.

Cons

• As sealed lead acid units, they are heavier and offer lower energy density than modern lithium alternatives.
• Specific cycle life and runtime depend on UPS load and are not enumerated in the product details, so exact run duration requires testing in your setup.

Specifications

Brand	Beiter DC Power
Product Type	20 hour sealed lead acid battery
Configuration	Set of 2 replacement batteries
Design	Maintenance free, valve regulated, spill-proof
Case Material	High impact non-conductive ABS plastic
Separator	Fine fiberglass mat

Our Verdict

For anyone replacing end-of-life batteries in an APC Back-UPS XS XS800 style UPS, this two-pack of Beiter DC Power sealed lead acid batteries is a sensible, cost-effective choice. The maintenance-free, valve regulated design and rugged ABS case make them a reliable, safe swap that balances durability and value for home offices and small IT setups.

Frequently Asked Questions

Are these batteries maintenance free?
Yes. They are valve regulated and sealed, designed for maintenance-free operation without the need to add water.

Can these be mounted in any orientation?
Yes. The spill-proof design with a fiberglass mat allows safe operation in various orientations.

Will these fit an APC Back-UPS XS XS800 style unit?
They are sold as replacement batteries intended for that UPS style; compatibility is the primary design goal.