APC Replacement Battery Cartridge vs APC UPS Replacement Battery Cartridge (2026): Key Differences
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You are comparing an apc replacement battery cartridge vs ups replacement battery cartridge to restore runtime in your APC UPS. Both are genuine APC RBC units tested for factory compatibility. The main difference lies in the specific UPS models they serve and their physical dimensions. You must match the RBC number to your unit. This guide breaks down the specs so you can pick the right fit without guessing.
Key differences
| Aspect | APC Replacement Battery Cartridge | APC UPS Replacement Battery Cartridge |
|---|---|---|
| model size | RBC2 | RBC17 |
| compatible back-ups | BK350, BK500, BK500BLK | BE650G1, BE850G2, BR700G |
| compatible smart-ups | SC420 | not listed |
| weight | 1.54 pounds | 6.31 pounds |
| installation | not listed | hot-swap ready |
Which one should you choose?
Choose APC Replacement Battery Cartridge if
- You own a BK350, BK500, BK500BLK, or SC420 UPS
- You need a lighter battery unit for easier handling
- Your UPS model requires the RBC2 form factor
Choose APC UPS Replacement Battery Cartridge if
- You own a BE650G1, BE850G2, BR700G, or similar Back-UPS
- You want a battery designed for hot-swap installation
- Your UPS model requires the RBC17 form factor
Verdict: Choose the RBC2 if your unit is a BK350, BK500, or SC420. Pick the RBC17 for BE650G1, BE850G2, or BR700G models. Always verify your UPS model number before ordering to ensure compatibility.
RBC2 vs RBC17 Battery Specs
Model Compatibility
You must match the battery to your specific UPS model to ensure proper operation. The APC Replacement Battery Cartridge (RBC2) is designed for Back-UPS models BK350, BK500, BK500BLK, and the Smart-UPS SC420. The APC UPS Replacement Battery Cartridge (RBC17) serves a different set of units, including Back-UPS models BE650G1, BE850G2, BR700G, BE850M2, BX850M, and BN900M. Each cartridge is tested and certified for its specific group. You should verify your UPS model number before purchasing either unit to avoid installation issues.
Physical Dimensions
The two cartridges have slightly different physical footprints. The RBC2 measures 2.52 inches in width, 3.7 inches in height, and 5.94 inches in length. The RBC17 is marginally narrower at 2.5 inches wide, slightly taller at 3.75 inches, and 6 inches long. These small differences matter for internal clearance within your UPS chassis. Both units are black and designed to fit their respective APC enclosures securely. You should check the internal space in your UPS to confirm which cartridge fits without modification.
Weight
There is a significant difference in weight between the two batteries. The RBC2 weighs 1.54 pounds, making it much lighter. The RBC17 weighs 6.31 pounds, which is more than four times heavier. This weight difference likely reflects the internal battery capacity and cell configuration required for the different UPS models they support. Heavier batteries often indicate a larger energy storage capacity, which can provide longer runtime for higher-power units. You should consider the weight when handling the installation.
Installation Ease
Both units are genuine APC replacement cartridges tested for compatibility to restore factory performance. The RBC17 explicitly mentions easy hot-swap installation with fully assembled assembly and simple instructions that do not require technical expertise or tools. The RBC2 data does not explicitly list this installation feature, though it is a standard replacement cartridge. If you prefer a unit marketed for straightforward, tool-free swapping, the RBC17 highlights this benefit clearly. Both aim to restore runtime without complex procedures.
Warranty Coverage
Both products offer the same manufacturer warranty support from APC. The RBC2 is backed by a 2-year manufacturer warranty. The RBC17 is also backed by a 2-year manufacturer warranty. This consistent coverage applies to genuine APC replacement batteries. You receive the same level of protection regardless of which cartridge you choose for your specific UPS model. This warranty helps ensure that the battery meets APC standards for quality and performance during its service life.
Choose Your APC Battery Cartridge
Owner of Back-UPS BK350 or BK500
You need the RBC2 cartridge for your specific APC Back-UPS models, including the BK350, BK500, and BK500BLK. This unit measures 5.94 by 2.52 by 3.7 inches and weighs 1.54 pounds. It restores your UPS performance to original factory specifications. Ensure your model matches before ordering to guarantee proper fit and function.
Owner of Back-UPS BE650G1 or BR700G
Your APC Back-UPS models, such as the BE650G1, BE850G2, or BR700G, require the RBC17 cartridge. This unit is larger, measuring 6 by 2.5 by 3.75 inches, and weighs 6.31 pounds. It is tested and certified for compatibility with these specific units. Install this cartridge to restore runtime and maintain reliable backup power for your connected devices.
Owner of Smart-UPS SC420
If you use the APC Smart-UPS SC420, you must select the RBC2 cartridge. This specific model is designed for that unit. The RBC17 will not fit or work correctly with this UPS. Use the RBC2 to ensure your system operates at factory specifications. Verify your UPS model number before purchasing to avoid compatibility issues.
The products compared
APC Replacement Battery Cartridge
Best for: APC Back-UPS and Smart-UPS battery replacement
- Warranty
- 2-Year Warranty
- Dimensions
- 5.94 × 2.52 × 3.7 inches
- Weight
- 1.54 pounds
View on Amazon: APC Replacement Battery Cartridge Affiliate link
This APC RBC2 cartridge restores runtime for specific UPS models. It measures 5.94 by 3.7 by 2.52 inches and weighs 1.54 pounds. The unit is certified for compatibility with Back-UPS and Smart-UPS units. You get a two-year manufacturer warranty for peace of mind. It fits BK350, BK500, and SC420 models. This cartridge helps maintain your backup power system.
Pros
- Certified for compatibility with original factory specifications
- Includes a two-year manufacturer warranty
- Specifically designed for APC Back-UPS and Smart-UPS models
- Compact dimensions of 5.94 by 3.7 by 2.52 inches
Cons
- Limited to specific APC model compatibility
- Requires verification before ordering to ensure fit
- Does not restore runtime if the UPS itself is faulty
Good fit if
- You own an APC Back-UPS BK350 or BK500
- You need a certified replacement for an SC420 Smart-UPS
- You want a warranty-backed battery cartridge
Skip if
- You use a non-APC UPS brand
- You need a battery for a different APC model line
- You are looking for a permanent UPS upgrade rather than a battery swap
Verdict: APC RBC2 Replacement Battery is a reliable swap for specific APC units. It fits users who need a certified cartridge for their BK350, BK500, or SC420 models.
APC UPS Replacement Battery Cartridge
Best for: APC Back-UPS BE650G1 and BR700G owners
- Warranty
- 2-Year Warranty
- Dimensions
- 6 × 2.5 × 3.75 inches
- Weight
- 6.31 pounds
View on Amazon: APC UPS Replacement Battery Cartridge Affiliate link
This APC RBC17 cartridge restores runtime for specific Back-UPS models. It measures 6 by 3.75 by 2.5 inches and weighs 6.31 pounds. The unit is hot-swappable for easy installation without tools. It carries a two-year manufacturer warranty. You should use this genuine part to maintain original factory specifications for compatible units like the BE650G1 or BR700G.
Pros
- Hot-swap installation requires no tools or technical expertise
- Two-year manufacturer warranty included
- Certified for compatibility with specific APC Back-UPS models
- Fully assembled and ready for immediate replacement
Cons
- Limited to specific APC Back-UPS models like BE650G1 and BR700G
- Heavier than some smaller replacement cartridges at 6.31 pounds
- Does not include a display or remote control
Good fit if
- You own an APC Back-UPS BE650G1, BR700G, or BE850G2
- You want a genuine APC part with a two-year warranty
- You need a simple hot-swap replacement without tools
Skip if
- You use a UPS model not listed in the compatibility range
- You need a battery for a different brand of UPS
- You require a lighter or more compact battery unit
Verdict: APC RBC17 Replacement Battery Cartridge fits users with BE650G1 or BR700G units who want a straightforward, tool-free replacement backed by a two-year warranty.
Specifications side by side
| Spec | APC Replacement Battery Cartridge | APC UPS Replacement Battery Cartridge |
|---|---|---|
| Warranty | 2-Year Warranty | 2-Year Warranty |
| Dimensions | 5.94 × 2.52 × 3.7 inches | 6 × 2.5 × 3.75 inches |
| Weight | 1.54 pounds | 6.31 pounds |
| Size | RBC2 | RBC17 |
| Color | black | Black |
| Model | RBC2 | RBC17 |
Frequently asked questions
Is the APC Replacement Battery Cartridge the same as the APC UPS Replacement Battery Cartridge?
No, they are distinct models designed for different UPS units. The APC Replacement Battery Cartridge (RBC2) fits Back-UPS models like the BK350 and Smart-UPS SC420. The APC UPS Replacement Battery Cartridge (RBC17) is intended for Back-UPS models such as the BE650G1 and BR700G. You must select the correct cartridge to ensure compatibility with your specific device.
What are the physical dimensions of the APC RBC2 cartridge?
The APC Replacement Battery Cartridge (RBC2) measures 5.94 inches in length, 2.52 inches in width, and 3.7 inches in height. It is a compact unit that weighs 1.54 pounds. These specific dimensions allow it to fit precisely into compatible Back-UPS and Smart-UPS enclosures without requiring modification to the housing.
How heavy is the APC UPS Replacement Battery Cartridge RBC17?
The APC UPS Replacement Battery Cartridge (RBC17) weighs 6.31 pounds. This is significantly heavier than the RBC2 model. The increased weight corresponds to its larger physical footprint, which measures 6 inches in length, 2.5 inches in width, and 3.75 inches in height. This size supports its use in larger Back-UPS units.
Can I use the RBC2 in a Back-UPS BE650G1?
No, you should not use the RBC2 in a Back-UPS BE650G1. The RBC2 is specifically designed for models like the BK350, BK500, and SC420. The BE650G1 requires the APC UPS Replacement Battery Cartridge (RBC17). Using the wrong cartridge may prevent the UPS from functioning correctly or charging properly.
What is the color of the APC replacement battery cartridges?
Both the APC Replacement Battery Cartridge (RBC2) and the APC UPS Replacement Battery Cartridge (RBC17) are black. This standard color coding helps identify genuine APC components. The casing color does not affect performance but ensures visual consistency with your existing APC UPS hardware.
Which model fits the Smart-UPS SC420?
The APC Replacement Battery Cartridge (RBC2) is the correct fit for the Smart-UPS SC420. This unit is also compatible with Back-UPS models BK350 and BK500. Ensure you purchase the RBC2 model to maintain the runtime and reliability specified for your SC420 device.