MKMKYEE 21V Lithium Replacement Battery & Charger — 4.0Ah Pack with LED Indicator for Cordless Tillers

This compact battery and charger combo delivers 21 volts at 4.0 amp-hours using lithium‑ion cells and includes a universal 100–240V charger with an LED charge indicator. Designed for small outdoor power tools such as cordless tillers and cultivators, the pack offers multi-layer safety protections and a lightweight build so you can get back to yard work without hauling cords or gas cans.

How long will this 21V 4.0Ah battery typically run a cordless tiller?

Runtime depends on tool load, soil conditions, and tiller motor efficiency, but a 4.0Ah pack gives a useful work window for light-to-moderate gardening tasks. Expect shorter runs under heavy digging and longer runs for light cultivation.

• Battery: 21V, 4000mAh (4.0Ah) lithium‑ion with 10 quality cells.
• Optimized for intermittent garden work and short sessions.
• Heavy-duty digging will reduce runtime; lighter aeration extends it.

What safety and charging features does the charger/battery include?

The pack and adapter include multiple protections to extend battery life and prevent damage. The charger supports worldwide AC input and shows charging status via an LED so you can monitor progress at a glance.

• Multi-protect system: overload, overheat, over-discharge, over-current, and over-voltage protection.
• Charger: 100–240V AC input, 1A adapter with US plug and LED indicator.
• Do not charge longer than 7 hours to protect battery health.

Will this pack fit my tool and how do I avoid buying the wrong 21V battery?

There are multiple 21V battery designs on the market and some look similar but fit different tools. Check your tool’s model and connector type, and contact the seller if you’re unsure to avoid purchasing an incompatible 21V "III" variant.

• Confirm matching connector and physical dimensions before purchase.
• If in doubt, provide your tool model to the seller for verification.
• Do not assume all 21V batteries are interchangeable; small design differences matter.

How should I charge and store the MKMKYEE battery to maximize lifespan?

Charge the battery fully before first use and avoid overcharging. Use the included 1A charger, limit charge sessions to under seven hours, and store the pack in a cool, dry place at partial charge for long-term storage.

• Fully charge before first use; follow the LED indicator for status.
• Do not exceed 7 hours per charge to preserve battery cells.
• Store at moderate temperature and 30–50% charge for long-term idle periods.

Who is this for: MKMKYEE’s 21V 4.0Ah battery and charger are aimed at homeowners and gardeners who use cordless tillers, small cultivators, and light-duty outdoor power tools that accept the specified 21V format. It’s a practical replacement or spare for people who need a portable, cord-free power solution with safety protections and a universal charger. If you need extended heavy-duty runtimes for commercial landscaping, consider higher-capacity or OEM-specified packs; for regular home gardening, this offer balances runtime, safety, and convenience.