{"id":58576,"date":"2022-04-28T23:56:10","date_gmt":"2022-04-28T23:56:10","guid":{"rendered":"https:\/\/www.microplanet.ma\/?post_type=product&#038;p=58576"},"modified":"2026-10-20T15:53:54","modified_gmt":"2026-10-20T15:53:54","slug":"3-cell-18650-battery-holder-series-3s","status":"publish","type":"product","link":"https:\/\/www.microplanet.ma\/en\/produit\/3-cell-18650-battery-holder-series-3s\/","title":{"rendered":"3-Cell 18650 Battery Holder, Series (3S)"},"content":{"rendered":"<h3>3-Cell 18650 Battery Holder in Series \u2014 11.1 V Nominal<\/h3>\n<p>This holder connects three 18650 cells <strong>in series<\/strong>, giving a nominal pack voltage of <strong>11.1 V<\/strong> and up to <strong>12.6 V<\/strong> when all three cells are fully charged (using cells rated 4.2 V maximum each). It lets you replace cells without soldering directly to them. The holder has positive and negative output; its output is unregulated and falls as the cells discharge.<\/p>\n<h4>Features<\/h4>\n<ul>\n<li>Holds three 18650 cells<\/li>\n<li>Internal 3S series connection<\/li>\n<li>11.1 V nominal; 12.6 V maximum pack voltage as listed<\/li>\n<li>Replaceable cells; no direct cell soldering<\/li>\n<li>Compact format for electronics and robotics projects<\/li>\n<li>Compatible with a suitable external 3S BMS (not included)<\/li>\n<\/ul>\n<h4>Specifications<\/h4>\n<ul>\n<li>Cell format: 18650 cylindrical cells<\/li>\n<li>Cell count\/configuration: 3 cells, 3S series<\/li>\n<li>Nominal voltage per cell: 3.6 or 3.7 V<\/li>\n<li>Nominal pack voltage: 10.8 or 11.1 V<\/li>\n<li>Maximum pack voltage: 12.6 V; 4.2 V maximum per cell as stated<\/li>\n<li>Output: positive and negative<\/li>\n<li>Built-in charging: no<\/li>\n<li>Built-in BMS protection: no<\/li>\n<li>Batteries included: no<\/li>\n<\/ul>\n<p>The exact low-voltage cutoff depends on the cells and protection system. Do not use the approximate 9 V low-pack figure as a universal cutoff.<\/p>\n<h4>How series connection works<\/h4>\n<p>In series, cell voltages add while amp-hour capacity remains that of one cell.<\/p>\n<pre dir=\"ltr\"><code>Cellule 1      Cellule 2      Cellule 3\n  3,7 V    +     3,7 V    +     3,7 V\n             = 11,1 V nominal<\/code><\/pre>\n<p>For three 3.7 V, 3000 mAh cells, the listed example is:<\/p>\n<ul>\n<li>Nominal pack voltage: 11.1 V<\/li>\n<li>Maximum pack voltage: 12.6 V<\/li>\n<li>Capacity: 3000 mAh, not 9000 mAh<\/li>\n<\/ul>\n<h4>Indicative 3S pack voltage<\/h4>\n<table>\n<thead>\n<tr>\n<th>Pack state<\/th>\n<th>Indicative total voltage<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Fully charged<\/td>\n<td>12.6 V<\/td>\n<\/tr>\n<tr>\n<td>Nominal<\/td>\n<td>11.1 V<\/td>\n<\/tr>\n<tr>\n<td>Low battery (source estimate)<\/td>\n<td>About 9 V<\/td>\n<\/tr>\n<tr>\n<td>Excessive discharge<\/td>\n<td>Avoid<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The safe minimum depends on the cell manufacturer\u2019s specifications and the protection circuit. A battery-management system (BMS) must be appropriate for the cells and project current. The holder itself provides no cell balancing or protection.<\/p>\n<h4>Charging and protection<\/h4>\n<p>For a rechargeable pack, use a properly designed 3S protection\/BMS system and a charger intended for a 3-series lithium-ion pack. The source specifies a 12.6 V CC\/CV charger. A BMS is not a charger, and a generic 12 V supply or single-cell 4.2 V charger is not a substitute. Confirm that the BMS provides the required cell-level protection and balancing for your cells; follow the cell maker\u2019s limits. Series lithium-ion cells require individual cell monitoring\/protection because total pack voltage alone cannot show whether one cell is overcharged or over-discharged.<\/p>\n<h4>Source usage sequence (verify your protection and wiring first)<\/h4>\n<ol>\n<li>Use three compatible cells of the same model, capacity and similar condition.<\/li>\n<li>Check that their voltages are reasonably matched before assembly.<\/li>\n<li>Insert each cell according to the holder\u2019s + and \u2212 markings.<\/li>\n<li>Measure the holder output with a multimeter.<\/li>\n<li>Connect the holder to a correctly wired 3S protection system suitable for the current.<\/li>\n<li>Connect the protected output to the device.<\/li>\n<li>Charge only with a suitable 3S lithium-ion charger and the required protection.<\/li>\n<\/ol>\n<h4>Example connection<\/h4>\n<pre dir=\"ltr\"><code>3 cellules 18650\n        \u2502\nPorte-batteries 3S\n        \u2502\n      BMS 3S\n        \u2502\nInterrupteur + fusible\n        \u2502\n Circuit ou appareil<\/code><\/pre>\n<p>Add a DC-DC converter between the protected pack and load if the circuit needs a stable voltage. Select the converter, BMS, wiring and fuse for the actual current and voltage.<\/p>\n<h4>Important precautions<\/h4>\n<ul>\n<li>Do not mix cells with different capacities or specifications; use a matched set.<\/li>\n<li>Do not mix new and used cells.<\/li>\n<li>Check cell voltages and polarity before installation.<\/li>\n<li>Never short-circuit the holder output.<\/li>\n<li>Do not charge this pack with a 1S\/4.2 V charger or a generic 12 V supply.<\/li>\n<li>Use a suitable 3S charger and protection system, and follow the cell manufacturer\u2019s limits.<\/li>\n<li>Do not use cells that are swollen, corroded or have damaged insulation.<\/li>\n<li>Ensure the device tolerates up to 12.6 V, not only 11.1 V nominal.<\/li>\n<li>Use a correctly rated fuse where needed.<\/li>\n<\/ul>\n<h4>Applications listed<\/h4>\n<ul>\n<li>Robots and electronic vehicles<\/li>\n<li>Small motors and geared motors<\/li>\n<li>Compatible 12 V LED lighting<\/li>\n<li>Portable audio amplifiers<\/li>\n<li>Wireless communication equipment<\/li>\n<li>DIY portable power projects<\/li>\n<li>Alarms and security systems<\/li>\n<li>Standalone measurement stations<\/li>\n<li>Solar projects with a suitable charger<\/li>\n<li>3S lithium-ion packs<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Wired 3-cell 18650 holder in series: 11.1 V nominal and up to 12.6 V. Cells, charger and BMS are not included.<\/p>\n","protected":false},"featured_media":58577,"template":"","meta":[],"product_brand":[],"product_cat":[346,318],"product_tag":[],"class_list":["post-58576","product","type-product","status-publish","has-post-thumbnail","product_cat-batteries-accessoires-en","product_cat-alimentation-mesure-en","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>3-Cell 18650 Battery Holder, Series (3S) | MicroPlanet<\/title>\n<meta name=\"description\" content=\"3-cell 18650 holder wired in series. 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