Features: 18V 4.0Ah replacement battery, it can work with many power tools. Large capacity battery allows long time working which lasts much longer than usual battery. High quality material, high product standards, protection from short circuit, internal overheating, overloading and overcharging, long service life and safe to use. No memory so it can charge at anytime. Virtually no self-discharge for maximum working efficiency. Suitable for working with power tools, electric drills, gardening tools, etc.