Battery 20V 4.0Ah Lithium-Ion

A 20V 4.0Ah lithium-ion battery made to fit selected cordless jobsite tools from CT5951 to CT5965. It is used as a replacement or spare power source when you need to keep compatible tools ready for work without waiting on a single battery.

Useful for trade jobs, workshop use, site work and home maintenance where cordless tools are used regularly through the day. A spare battery like this helps when moving between cutting, fastening, drilling or general fitting tasks, especially if one battery is already on charge or you want to keep a second pack available for longer jobs.

The 4000mAh capacity gives you a 4.0Ah battery size suited to repeated use with the listed compatible models. As a 20V lithium-ion battery, it is built around a common cordless power format used across the stated CT5951 to CT5965 range, making it a practical choice if you already own tools in that series. Keeping a matching spare battery to hand can help avoid unnecessary downtime and makes it easier to rotate power packs during regular work.

Replacement battery specifications

• Voltage: 20V battery for compatible cordless jobsite tools.
• Capacity: 4.0Ah / 4000mAh for longer use between charges than lower-capacity packs.
• Battery type: Lithium-ion format.
• Fitment: Made to fit models CT5951, CT5952, CT5953, CT5954, CT5955, CT5956, CT5957, CT5958, CT5959, CT5960, CT5961, CT5962, CT5963, CT5964 and CT5965.
• Use: Suitable as a replacement or spare battery for keeping compatible tools ready for ongoing jobs.

A straightforward option for keeping compatible cordless tools powered and ready for use.