2Pack 40V 3.6Ah Replacement for Black and Decker 40V Battery Lithium LBX2040 LBXR36 LBXR2036 LST540 LCS1240 LBX1540 LST136W Compatible with Black Decker 40V String Trimmer Sweeper Mower Tools(2Pack)

What It Is

This is a 2-pack of aftermarket 40V 3.6Ah lithium-ion batteries designed to replace Black+Decker OEM batteries in cordless outdoor power equipment—string trimmers, leaf blowers, hedge trimmers, chainsaws, and push mowers that use the 40V MAX platform.

Fitment & Compatibility

• OEM replacements: Directly replaces Black+Decker models LBX2040, LBXR36, LBXR2036, LST540, LCS1240, LBX1540, LST136W, and others in the 40V MAX line.
• Tool compatibility: Fits any Black+Decker 40V tool with the standard slide-on battery mount (common on trimmers, blowers, mowers, and sweepers). Not compatible with older 18V or 20V systems.
• Physical check: Measure your existing battery slot—these are the standard 40V slide-pack shape, but aftermarket batteries can be slightly thicker or have tighter rails. Test fit before use.
• Voltage & capacity: 40V nominal, 3.6Ah (130Wh). Slightly higher capacity than the OEM 2.0Ah or 2.5Ah packs, so runtime will be longer, but weight is also a bit heavier.

Key Things to Know

• Installation: Slide on until it clicks, no tools needed. If it doesn’t lock firmly, check the battery rails for burrs or debris.
• Quality concerns: Aftermarket cells may not match OEM cycle life or thermal performance. Some users report early failure after a season of heavy use. Keep receipts.
• Charger compatibility: Works with Black+Decker 40V chargers (model LCS120, LCS121, etc.). Do not use with non-40V chargers.
• Storage: Store at 40–80% charge in cool, dry conditions. Full discharge or freezing temps can permanently reduce capacity.

Should You Buy It

Right for you if you need a budget-friendly spare set for light-to-moderate yard work (trimming, blowing) and don’t mind slightly heavier packs with shorter lifespan than OEM. Not ideal for heavy commercial use or if you rely on maximum runtime in cold weather.