Husqvarna BLi20 40V Lithium-Ion Battery

What It Is

The Husqvarna BLi20 is a 40V lithium-ion battery designed to power Husqvarna’s 40V battery platform, including lawn mowers, trimmers, chainsaws, and blowers. It provides cordless operation for medium-duty residential yard work, with a 4.0 Ah capacity for extended runtime.

Fitment & Compatibility

• Brand fit: Only compatible with Husqvarna 40V tools (e.g., LC 141i mower, 115iL trimmer, 320iB blower). Not cross-compatible with other brands or Husqvarna’s 36V/56V/80V systems.
• Model check: Verify your tool’s model number lists BLi20 as an approved battery. Look for “40V” and “BLi20” on the tool’s battery port or manual.
• Physical fit: Dimensions: 5.3 x 3.5 x 4.7 inches; weight ~2.2 lbs. Ensure your tool’s battery compartment accepts this size (most 40V Husqvarna tools do).
• OEM vs aftermarket: Use only OEM BLi20 for guaranteed compatibility and warranty. Third-party “40V Husqvarna compatible” batteries may not fit or charge properly and can damage the tool.
• Charger: Works with Husqvarna QC80, QC250, and QC330 rapid chargers. Do not use non-Husqvarna chargers.

Key Things to Know

• Installation: Slide battery into tool’s bay until it clicks; press release tab to remove. No tools needed.
• Runtime: 4.0 Ah delivers roughly 30-45 minutes of mowing (depending on grass height and speed). For larger lawns (over ¼ acre), consider a second battery.
• Cold weather: Performance drops below 32°F. Store indoors and charge only above 40°F.
• Common gotcha: If battery won’t charge, check charger light pattern—flashing red indicates a temperature or connection issue. Let battery cool 30 minutes before retrying.

Should You Buy It

Buy this battery if you already own a Husqvarna 40V tool and need a reliable, OEM replacement or spare for medium-sized lawns. It’s also a good choice if you’re starting a Husqvarna 40V system and want a proven battery with solid runtime. Skip it if you need higher capacity (look at BLi30 or BLi200) or are on a tight budget—aftermarket options exist but risk compatibility and safety.