Battery Makita WA3644 20V Li-Ion 4.0Ah for power tools

Makita WA3644 20V Li‑Ion 4.0Ah replacement battery is designed to provide portable, rechargeable power for compatible cordless Makita tools. The battery combines a 20V nominal voltage with 4.0Ah capacity to deliver extended runtime compared with lower‑capacity packs while maintaining a compact form factor suitable for hand tools. It is intended for straightforward battery swaps on Makita 20V platforms that accept this style of pack, supporting tasks such as drilling, screwdriving and general light to medium‑duty cordless applications.

Advantages

The battery offers a balance of capacity and weight to extend working time without significantly increasing tool bulk. Its lithium‑ion chemistry provides stable power output during use and low self‑discharge for convenient storage. The pack’s design allows quick replacement in compatible tools, reducing downtime on job sites and at home. The 4.0Ah capacity increases runtime relative to smaller packs, helping complete more tasks between charges.

Suitable for

• Drilling and driving in wood, metal and masonry for light to medium workloads
• Portable power for cordless screwdrivers, drills and impact drivers
• Home renovation and repair tasks that require extended runtime
• Job‑site use where quick battery swaps are needed to maintain productivity

Key specifications

• Nominal voltage: 20V
• Battery chemistry: Lithium‑ion (Li‑Ion)
• Rated capacity: 4.0 Ah
• Form factor: Slide‑style pack compatible with Makita 20V tool platforms that accept WA3644‑style batteries
• Typical applications: Cordless drills, drivers and other 20V handheld power tools

How to use

Ensure the tool and battery contacts are clean and dry before installation. Align the battery pack with the tool’s battery slot and slide it in until it clicks and locks in place. To charge, insert the battery into a compatible charger designed for 20V Li‑Ion packs and follow the charger's indicator lights and instructions. Remove the battery by unlocking the release latch and sliding the pack out. Do not expose the battery to water, extreme heat, or open flame; follow manufacturer guidance for safe charging and storage.

Usage recommendations

For optimal battery life, use a compatible Makita 20V charger, avoid full discharges when possible, store the battery in a cool, dry place, and inspect connectors regularly. Replace the battery if it shows signs of damage, swelling or significant capacity loss.