{"id":781,"date":"2025-07-03T22:27:42","date_gmt":"2025-07-03T20:27:42","guid":{"rendered":"https:\/\/wp.stromer-tech.info\/?post_type=ht_kb&#038;p=781"},"modified":"2025-07-19T18:54:15","modified_gmt":"2025-07-19T16:54:15","slug":"fast-charging-a-calculation-example","status":"publish","type":"ht_kb","link":"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/schnellladen-ein-rechenbeispiel\/","title":{"rendered":"Fast charging?  ...a calculation example"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Every now and then the question is asked about fast charging a power battery. Here is an example calculation and some information on the subject.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Initial situation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Battery: BQ983, blue<br>Configuration: 13S6P cells<br>Cell:&nbsp;<a href=\"https:\/\/www.nkon.nl\/sk\/k\/Specification%20INR18650MJ1%2022.08.2014.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">LG INR18650MJ1<\/a>Nominal capacity: 3.5 Ah. <br>Recommended charging current 0.5C (1.75 A), max. 1C (3.5 A)<br>CR246 charger: Charging current max. 4.5 A<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Invoice<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The 4.5 A of the charger is distributed over the 6 strings = 0.75 A per string\/cell. This corresponds to 43 % of the recommended charging current (0.5C) or 22 % of 1C.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From the battery's point of view, higher charging currents would therefore be possible without 'stressing' the battery.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is it possible to fast charge in one hour instead of the regular five?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">To do this, we would have to charge with 5x more charging current, i.e. 22.5 A. Using the same calculation, we now arrive at 3.75 A per string or cell. This would also just exceed 1C (3.5 A), the maximum charging current of the cell.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What are the arguments against fast charging?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>No manufacturer supplies chargers with 22.5 A charging current for their bikes. The thing would be too big, too heavy and too expensive.<\/li>\n\n\n\n<li>S-pedelec batteries are usually pushed to the limits of their specifications when riding. Stressing them during charging is detrimental to their service life.<\/li>\n\n\n\n<li>Stromer batteries roughly degenerate at 1% SoH per 1,000 km. After 25,000 km, or the theoretically achieved SoH of 75 %, a new battery would be due. Fast charging would be on top of this and would further shorten the life of the battery. This would probably not be a problem for occasional drivers, but it would be for commuters with longer journeys to work.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">&gt; <a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/recuperation-and-recuperation\/\" data-type=\"ht_kb\" data-id=\"534\">See<\/a> also BREMSEN - <em>'Recuperation and recuperation'<\/em> - Good to know<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>Hin und wieder wird die Frage nach Schnellladen eines Stromerakkus gestellt. Hier ein Rechenbeispiel und ein paar Information zum Thema. Ausgangslage Akku: BQ983, blauKonfiguration: 13S6PZellenZelle:&nbsp;LG INR18650MJ1, Nennkapazit\u00e4t: 3.5 Ah. Empfohlener Ladestrom 0.5C (1.75 A), max. 1C (3.5 A)CR246 Ladeger\u00e4t: Ladestrom max. 4.5 A Rechnung Die 4.5 A des Ladeger\u00e4ts verteilen&#8230;<\/p>","protected":false},"author":1,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[97],"ht-kb-tag":[],"class_list":["post-781","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-akku"],"_links":{"self":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/781","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/comments?post=781"}],"version-history":[{"count":7,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/781\/revisions"}],"predecessor-version":[{"id":3618,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/781\/revisions\/3618"}],"wp:attachment":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/media?parent=781"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-category?post=781"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-tag?post=781"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}