The right category starts with matching voltage to your tools, followed by capacity, runtime, and weight considerations. Look for a Greenworks battery that fits the tool family you own and provides enough run-time for your typical tasks. Consider compatibility, charge time, and warranty terms to get the best value. Avoid mixing different voltage classes or generations.

Voltage determines the power class of the tool, while capacity indicates how long the battery will last. A higher voltage lets heavier tools run smoothly, but runtime depends on capacity (Ah) and the tool's load. Energy in watt-hours (Wh) equals voltage times capacity, so higher Wh means longer runtime for the same task. Real-world runtime varies with task, speed settings, and temperature.

Casual users benefit from mid-capacity batteries for lighter tasks to keep weight manageable. Professionals will prefer higher-capacity units for longer sessions and tougher tasks. Assess your typical jobs, frequency of use, and tolerance for recharge breaks to pick the right balance.

Always use the official Greenworks charger designed for the battery, and never force connections. Store the battery in a cool, dry place and avoid extreme temperatures. Keep contact surfaces clean and dry, using a dry cloth if needed. Ensure your tools belong to the Greenworks 40V system for full compatibility.

Don't mix batteries across different voltage classes or tool families. Avoid purchasing non-original chargers or batteries from untrusted sellers. Don’t ignore warranty terms or maintenance recommendations that protect performance.