RYOBI 40-Volt Slim Pack Accessory Battery

What It Is

The RYOBI 40-Volt Slim Pack Accessory Battery is a compact, 2.0Ah lithium-ion battery designed to power RYOBI 40V outdoor equipment, including cordless lawn mowers, string trimmers, blowers, and hedge trimmers. Its slim profile saves weight and space, making it ideal for lighter tasks or as a backup battery.

Fitment & Compatibility

• Voltage & System: Works only with RYOBI 40V tools (not 18V or 36V systems). Check that your mower or tool is labeled “40V” and uses the standard RYOBI slide-on battery interface.
• Mower Types: Compatible with RYOBI 40V push mowers (e.g., models RY40180, RY401120) and self-propelled models (e.g., RY401140). Not for older 40V brushed models or non-RYOBI brands.
• Physical Fit: The slim pack is shorter than standard 40V batteries (like the 4.0Ah or 6.0Ah). It fits all RYOBI 40V battery ports, but may leave a gap in some mower compartments—no performance issue, but confirm clearance if your mower has a tight battery tray.
• What to Check Before Buying: Verify your tool’s model number (on the tool’s label or manual) is listed as compatible on RYOBI’s site. Measure your current battery compartment if you’re unsure about the slim pack’s dimensions (approx. 5.5 x 4 x 3 inches).

Key Things to Know

• Capacity vs. Weight: 2.0Ah means shorter runtime (about 20–35 minutes on a mower) but significantly lighter (1.5 lbs vs. 3–4 lbs for larger packs). Great for trimming or quick mowing, not for large lawns.
• Installation: Slide on and off—no tools. Ensure the latch clicks fully; a loose connection causes intermittent power.
• Common Gotchas: Won’t charge on older RYOBI 40V chargers (pre-2019 models). Use the included 40V charger or a newer model (e.g., OP4040). The slim pack is not compatible with RYOBI 40V riding mowers or snow blowers.
• Quality: User-reported issues with premature failure (e.g., cells dying after 1–2 seasons). Warranty is 3 years, but register immediately for coverage.

Should You Buy It

Buy this if you already own RYOBI 40V tools and need a lightweight, portable battery for quick jobs or as a spare for smaller yards (under 1/4 acre). Skip it if you mow a large lawn or need heavy runtime—invest in a 4.0Ah or 6.0Ah pack instead.