21V 4000mAh Lithium Battery Pack for Power Electric Wrench and Energy Storage

This 21V lithium battery pack is a rechargeable cylindrical battery designed for power electric wrenches and power energy storage. It uses a 5S2P combination of 18650 cylindrical lithium cells, with a nominal voltage of 21V and a nominal capacity of 4000mAh. The pack is built for repeated charging and discharging, with a stated cycle life of 500 cycles. It has a flat head battery cap and measures 119 x 74 x 68mm, weighing 576g. The charging voltage is 21V and the discharge voltage is 21V, with a charging current of 2A and a discharge current of 4A. The maximum continuous discharge current is 4A and the maximum continuous charging current is 2A. Charging takes approximately 1 to 1.5 hours. The monthly self-discharge rate is 30 microampere per hour. The anti-counterfeiting code is XN 18650-5S2P. The pack is supplied as one battery.

Features and Construction

The battery is assembled from cylindrical lithium cells in a 5S2P arrangement, a configuration that combines five cells in series with two parallel strings to deliver the stated 21V nominal voltage and 4000mAh nominal capacity. The flat head cap gives the pack a flat contact surface. The pack is intended for power electric wrench and power energy storage use, and its electrical ratings are listed for charging and discharging.

Material and Build

The pack uses cylindrical lithium battery cells and is described as using a product A cell standard. The 5S2P combination method means the cells are arranged in a 5-series, 2-parallel configuration. The battery type is cylindrical lithium battery, and the cap is a flat head. These construction details relate directly to how the pack fits and connects in compatible devices. The pack weighs 576g and has an anti-counterfeiting code of XN 18650-5S2P.

Size and Practical Fit

The product size is 119 x 74 x 68mm, and the outer packing size is 20 x 30 x 40cm. These dimensions describe the physical size of the battery pack and its outer packaging. At 576g, the pack has a moderate weight for a 21V 4000mAh lithium battery. The flat head battery cap is part of the physical profile that determines fit in a matching battery compartment. The dimensions given are the only size data provided for the product.

Uses and Placement

The stated scope of use is power energy storage, and the battery is also described as suitable for a power electric wrench. This means it can be used as a rechargeable power source in compatible tools and storage setups. The electrical ratings support charging at 21V with a 2A current and discharging at 21V with a 4A current. The pack is not described for any other specific device or application.

Event or Professional Use

For professional or workshop use, the 21V lithium battery pack can serve as a power source for a compatible power electric wrench. The 4000mAh nominal capacity and 4A discharge current are the relevant ratings for such use. The 500-cycle life indicates the pack is intended for repeated charge and discharge cycles. Charging from empty takes about 1 to 1.5 hours at the stated 2A charging current. These figures come directly from the product data.

Everyday Home Use

For home use, the battery can be kept as a spare or replacement pack for a compatible 21V power electric wrench. It can also be used in power energy storage applications where a 21V 4000mAh cylindrical lithium pack is required. The flat head cap and 119 x 74 x 68mm size are the physical details to check against the device compartment. The pack weighs 576g, so it is easy to handle and store. No other household uses are stated in the source data.

Benefits and Buying Value

The main practical benefit is a rechargeable 21V lithium battery with a 4000mAh capacity and a 5S2P cell arrangement. The stated 500-cycle life and 1 to 1.5 hour charging time are useful for planning repeat use. The pack is supplied as a single battery, so it can be used as a direct replacement or spare where a 21V 4000mAh pack with a flat head cap is required. The anti-counterfeiting code XN 18650-5S2P is provided for identification.

Reuse and Low Maintenance

The battery is rechargeable and rated for 500 cycles, so it can be charged and discharged repeatedly within the stated parameters. The monthly self-discharge rate of 30 microampere per hour is a low figure for a lithium pack, which helps it retain charge when not in use. Maintenance is limited to charging at the specified 21V and 2A, discharging within the 4A limits, and keeping the terminals clean and dry. No other maintenance instructions are provided in the source data.

Why Choose This Product

Choose this pack if you need a 21V 4000mAh lithium battery in a 5S2P cylindrical format for a power electric wrench or power energy storage. The flat head cap, 119 x 74 x 68mm size, and 576g weight are the key physical details to match against your device. The electrical ratings are clearly stated: 21V charging and discharge voltage, 2A charging current, 4A discharge current, and 4A maximum continuous discharge current. The pack is supplied as one battery. No price, savings, or comparison figures are provided in the source text.