{"product_id":"cylindrical-lithium-battery-21v-4000mah-power-tool-battery-pack-5s2p-18650-cells-compatible-with-electric-wrench-for-power-energy-storage-576g-119x74x68mm-flat-head-cap","title":"Cylindrical Lithium Battery 21V 4000mAh Power Tool Battery Pack 5S2P 18650 Cells Compatible with Electric Wrench for Power Energy Storage 576g 119x74x68mm Flat Head Cap","description":"\u003ch1\u003e21V 4000mAh Lithium Battery Pack for Power Tools and Energy Storage\u003c\/h1\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"21V 4000mAh lithium battery pack with flat head cap, 5S2P configuration, 119x74x68mm\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/6398\/2025-10-31\/original-image\/08d9dcb1-521d-4ea4-b8a3-1afa37889bd9.webp\"\u003e\u003c\/div\u003eThis 21V cylindrical lithium battery pack is designed to deliver consistent power for electric wrenches and other power energy storage applications. With a nominal capacity of 4000mAh and a 5S2P configuration using product A grade 18650 cells, it offers a practical power solution for maintenance, assembly, or workshop tasks. The battery is built for repeated use, with up to 500 charge cycles supporting long-term value. Compact and lightweight at 576g, it fits comfortably into compatible tool handles and battery compartments.\n\n\u003ch2\u003eFeatures and Construction\u003c\/h2\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"21V 4000mAh lithium battery pack with flat head cap, 5S2P configuration, 119x74x68mm\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/6398\/2025-10-31\/original-image\/1d7d473b-f3fe-4bde-b101-fe7531931d57.webp\"\u003e\u003c\/div\u003eThis battery pack is assembled with precision to meet the demands of power tool use. The following sections detail its build, dimensions, and electrical characteristics.\n\n\u003ch3\u003eMaterial and Build\u003c\/h3\u003eThe pack uses product A grade cylindrical lithium cells (18650-5S2P) with a flat head cap. The combination method is 5S2P, meaning five cells in series and two parallel groups, achieving a nominal voltage of 21V and a capacity of 4000mAh. The outer packing size is 20 x 30 x 40cm, and the product itself measures 119 x 74 x 68mm.\n\n\u003ch3\u003eSize and Practical Fit\u003c\/h3\u003eWeighing 576g, the battery is portable and easy to handle. Its dimensions of 119 x 74 x 68mm allow it to fit into compatible electric wrench battery slots and other power tool compartments. The flat head cap design ensures secure connection with compatible terminals.\n\n\u003ch2\u003eUses and Placement\u003c\/h2\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"21V 4000mAh lithium battery pack with flat head cap, 5S2P configuration, 119x74x68mm\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/6398\/2025-10-31\/original-image\/2401301558270321000.webp\"\u003e\u003c\/div\u003eThis battery is intended for power energy storage applications, particularly with electric wrenches. It supports both home and professional use scenarios where cordless operation is needed.\n\n\u003ch3\u003eEvent or Professional Use\u003c\/h3\u003eFor contractors or technicians working on job sites, this battery provides a reliable 21V power source for electric wrenches used in fastening, assembly, or maintenance tasks. The 4000mAh capacity supports extended work sessions between charges.\n\n\u003ch3\u003eEveryday Home Use\u003c\/h3\u003eHome DIY enthusiasts can use this battery with compatible power tools for projects around the house, from assembling furniture to minor repairs. The compact size and 576g weight make it easy to store and carry.\n\n\u003ch2\u003eBenefits and Buying Value\u003c\/h2\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"21V 4000mAh lithium battery pack with flat head cap, 5S2P configuration, 119x74x68mm\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/6398\/2025-10-31\/original-image\/2401301558270321600.webp\"\u003e\u003c\/div\u003eThis battery pack combines practical electrical specs with a robust design for repeated use. Its key advantages include a stable discharge current and a low self-discharge rate.\n\n\u003ch3\u003eReuse and Low Maintenance\u003c\/h3\u003eWith 500 charge cycles and a monthly self-discharge rate of only 30 microampere per hour, the battery retains charge well during storage. Charging at 2A takes just 1 to 1.5 hours, minimising downtime between uses.\n\n\u003ch3\u003eWhy Choose This Product\u003c\/h3\u003eThis battery pack offers a direct replacement or upgrade for compatible 21V power tools. Its 5S2P configuration provides a balance of voltage and capacity, and the use of product A cells supports consistent performance over its service life.\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"21V 4000mAh lithium battery pack with flat head cap, 5S2P configuration, 119x74x68mm\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/6398\/2025-10-31\/original-image\/2401301558270322200.webp\"\u003e\u003c\/div\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"21V 4000mAh lithium battery pack with flat head cap, 5S2P configuration, 119x74x68mm\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/6398\/2025-10-31\/original-image\/2401301558270322700.webp\"\u003e\u003c\/div\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"21V 4000mAh lithium battery pack with flat head cap, 5S2P configuration, 119x74x68mm\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/6398\/2025-10-31\/original-image\/46696902-3c05-48f3-ac55-f905f4cd50c5.webp\"\u003e\u003c\/div\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"21V 4000mAh lithium battery pack with flat head cap, 5S2P configuration, 119x74x68mm\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/6398\/2025-10-31\/original-image\/888166a3-2dd5-4d7f-b1f7-e6e8fd07482d.webp\"\u003e\u003c\/div\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"21V 4000mAh lithium battery pack with flat head cap, 5S2P configuration, 119x74x68mm\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/6398\/2025-10-31\/original-image\/ac8f3e01-29db-47bf-a8db-e9099e8fff32.webp\"\u003e\u003c\/div\u003e\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"21V 4000mAh lithium battery pack with flat head cap, 5S2P configuration, 119x74x68mm\" src=\"https:\/\/images.seoo.uk\/src\/products\/shopify_export\/US10\/6398\/2025-10-31\/original-image\/e278b82c-1b00-432a-b6a7-362ecd74b9ff.webp\"\u003e\u003c\/div\u003e","brand":"pyacqf-q2","offers":[{"title":"18650 5S2P \/ 21V \/ 4000mAh","offer_id":58193470161270,"sku":"CJYD196055001AZ","price":76.88,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0988\/3920\/0118\/files\/46696902-3c05-48f3-ac55-f905f4cd50c5.webp?v=1782987403","url":"https:\/\/pyacqf-q2.myshopify.com\/products\/cylindrical-lithium-battery-21v-4000mah-power-tool-battery-pack-5s2p-18650-cells-compatible-with-electric-wrench-for-power-energy-storage-576g-119x74x68mm-flat-head-cap","provider":"CozyCurator","version":"1.0","type":"link"}