{"product_id":"4s2p-21700-battery-kit-copper-busbars-tray-optional-cells","title":"4S2P 21700 Battery Kit - Copper Busbars, Tray \u0026 Optional Cells","description":"\u003cdiv class=\"diy-kit-description\"\u003e\n\u003ch2\u003e4S2P 21700 Battery Kit\u003c\/h2\u003e\n\u003cp\u003eBuild a 4-series, 2-parallel 21700 lithium-ion pack using a purpose-matched tray and precision battery-building materials. Choose the \u003cstrong\u003ekit only\u003c\/strong\u003e or add one of the listed cell models. A cell-inclusive selection contains \u003cstrong\u003e8 cells total\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eChoose Your Configuration\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit only - no cells:\u003c\/strong\u003e battery-building hardware without cells.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCell option:\u003c\/strong\u003e adds 8 cells of the selected model and links those cells directly to Shopify inventory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.2mm copper + 12 AWG:\u003c\/strong\u003e lighter build option.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.3mm copper + 10 AWG:\u003c\/strong\u003e heavier-conductor option for builders prioritizing lower conductor resistance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKit Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCustom lightweight 4S2P tray for 8 21700 cells\u003c\/li\u003e\n\u003cli\u003ePrecision-cut copper busbar set for the selected build option\u003c\/li\u003e\n\u003cli\u003eStainless-steel welding circles for copper-to-cell sandwich welding\u003c\/li\u003e\n\u003cli\u003eMatched power leads for the selected cable option\u003c\/li\u003e\n\u003cli\u003eSelected cells only when a cell-inclusive option is chosen\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eThis is an unassembled DIY battery-building kit, not a finished battery pack.\u003c\/strong\u003e Spot welding, insulation, BMS\/protection selection, balance wiring, pack validation, and final enclosure are the builder's responsibility.\u003c\/p\u003e\n\u003ch3\u003eImportant Electrical Guidance\u003c\/h3\u003e\n\u003cp\u003ePack capability depends on the selected cells, weld quality, current sharing, conductor geometry, BMS limits, fusing, cooling, and the completed pack design. Manufacturer data-sheet maximum ratings are limits, not automatic recommendations for continuous pack operation. Design with appropriate current and thermal headroom.\u003c\/p\u003e\n\u003ch3\u003eSafety Warning\u003c\/h3\u003e\n\u003cp\u003eUse only new, matched cells in a properly engineered pack. Insulate all conductive layers, protect against shorts and abrasion, use correctly rated BMS and fusing, verify polarity before welding, and monitor cell voltage and temperature during assembly and testing. Lithium-ion cells can vent, ignite, or cause serious injury if shorted, crushed, punctured, overheated, overcharged, over-discharged, or assembled incorrectly. Intended for experienced battery builders.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"DIY500AMP.COM","offers":[{"title":"Kit only - no cells \/ 0.2mm copper + 12 AWG cables","offer_id":43034202505287,"sku":"D5A-4S2P-KIT-CU02-12AWG","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Kit only - no cells \/ 0.3mm copper + 10 AWG cables","offer_id":43034202538055,"sku":"D5A-4S2P-KIT-CU03-10AWG","price":53.99,"currency_code":"USD","in_stock":true},{"title":"EVE 40PL \/ 0.2mm copper + 12 AWG cables","offer_id":43034202570823,"sku":"D5A-4S2P-EVE40PL-CU02-12AWG","price":87.99,"currency_code":"USD","in_stock":true},{"title":"EVE 40PL \/ 0.3mm copper + 10 AWG cables","offer_id":43034202603591,"sku":"D5A-4S2P-EVE40PL-CU03-10AWG","price":95.99,"currency_code":"USD","in_stock":true},{"title":"Ampace JP40 \/ 0.2mm copper + 12 AWG cables","offer_id":43034202636359,"sku":"D5A-4S2P-JP40-CU02-12AWG","price":85.99,"currency_code":"USD","in_stock":true},{"title":"Ampace JP40 \/ 0.3mm copper + 10 AWG cables","offer_id":43034202669127,"sku":"D5A-4S2P-JP40-CU03-10AWG","price":93.99,"currency_code":"USD","in_stock":true},{"title":"EVE 50PL \/ 0.2mm copper + 12 AWG cables","offer_id":43034202701895,"sku":"D5A-4S2P-EVE50PL-CU02-12AWG","price":97.99,"currency_code":"USD","in_stock":true},{"title":"EVE 50PL \/ 0.3mm copper + 10 AWG cables","offer_id":43034202734663,"sku":"D5A-4S2P-EVE50PL-CU03-10AWG","price":105.99,"currency_code":"USD","in_stock":true},{"title":"TENPOWER 50XG \/ 0.2mm copper + 12 AWG cables","offer_id":43034202767431,"sku":"D5A-4S2P-TP50XG-CU02-12AWG","price":105.99,"currency_code":"USD","in_stock":true},{"title":"TENPOWER 50XG \/ 0.3mm copper + 10 AWG cables","offer_id":43034202800199,"sku":"D5A-4S2P-TP50XG-CU03-10AWG","price":113.99,"currency_code":"USD","in_stock":true},{"title":"Reliance RS50 \/ 0.2mm copper + 12 AWG cables","offer_id":43034202832967,"sku":"D5A-4S2P-RS50-CU02-12AWG","price":101.99,"currency_code":"USD","in_stock":true},{"title":"Reliance RS50 \/ 0.3mm copper + 10 AWG cables","offer_id":43034202865735,"sku":"D5A-4S2P-RS50-CU03-10AWG","price":109.99,"currency_code":"USD","in_stock":true},{"title":"Ampace JP50 \/ 0.2mm copper + 12 AWG cables","offer_id":43034202898503,"sku":"D5A-4S2P-JP50-CU02-12AWG","price":103.99,"currency_code":"USD","in_stock":true},{"title":"Ampace JP50 \/ 0.3mm copper + 10 AWG cables","offer_id":43034202931271,"sku":"D5A-4S2P-JP50-CU03-10AWG","price":111.99,"currency_code":"USD","in_stock":true},{"title":"LinkData 55P \/ 0.2mm copper + 12 AWG cables","offer_id":43034202964039,"sku":"D5A-4S2P-LD55P-CU02-12AWG","price":115.99,"currency_code":"USD","in_stock":true},{"title":"LinkData 55P \/ 0.3mm copper + 10 AWG cables","offer_id":43034202996807,"sku":"D5A-4S2P-LD55P-CU03-10AWG","price":123.99,"currency_code":"USD","in_stock":true},{"title":"LinkData 65P \/ 0.2mm copper + 12 AWG cables","offer_id":43034203029575,"sku":"D5A-4S2P-LD65P-CU02-12AWG","price":165.99,"currency_code":"USD","in_stock":false},{"title":"LinkData 65P \/ 0.3mm copper + 10 AWG cables","offer_id":43034203062343,"sku":"D5A-4S2P-LD65P-CU03-10AWG","price":173.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0588\/8055\/7127\/files\/diy500amp-4s2p-21700-battery-kit-configuration.png?v=1785699393","url":"https:\/\/diy500amp.com\/products\/4s2p-21700-battery-kit-copper-busbars-tray-optional-cells","provider":"DIY500AMP.COM","version":"1.0","type":"link"}