{"id":664,"date":"2025-07-03T03:39:58","date_gmt":"2025-07-03T01:39:58","guid":{"rendered":"https:\/\/wp.stromer-tech.info\/?post_type=ht_kb&#038;p=664"},"modified":"2026-08-11T09:25:03","modified_gmt":"2026-08-11T07:25:03","slug":"e-21041c-battery-does-not-charge","status":"publish","type":"ht_kb","link":"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/e-21041c-akku-laedt-nicht\/","title":{"rendered":"E 21041C | Battery does not charge"},"content":{"rendered":"<h3 class=\"wp-block-heading\">Problem<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Battery is not charging. Charging indicator flashes or lights up red.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cause<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Charging current below 400 mA and SoC &lt;90 %. This may be due to poor contact of the Rosenberger connector. <br>\n<ul class=\"wp-block-list\">\n<li>Charger plug &gt; Charging socket in the top tube<\/li>\n\n\n\n<li>Charger plug &gt; Battery socket (battery outside the power supply)<\/li>\n\n\n\n<li>Battery socket &gt; Battery socket in battery compartment (battery in Stromer)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Pollution, water, or corrosion can also be the cause. The Rosenberger connectors and sockets are magnetic and attract the smallest metal particles, which can lead to short circuits.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"731\" src=\"https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Rosenbergerstecker-buchse-Defekte-1024x731.jpeg\" alt=\"\" class=\"wp-image-10019\" style=\"width:600px\" srcset=\"https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Rosenbergerstecker-buchse-Defekte-1024x731.jpeg 1024w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Rosenbergerstecker-buchse-Defekte-300x214.jpeg 300w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Rosenbergerstecker-buchse-Defekte-768x548.jpeg 768w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Rosenbergerstecker-buchse-Defekte-50x36.jpeg 50w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Rosenbergerstecker-buchse-Defekte-1536x1096.jpeg 1536w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Rosenbergerstecker-buchse-Defekte-18x12.jpeg 18w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Rosenbergerstecker-buchse-Defekte-60x43.jpeg 60w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Rosenbergerstecker-buchse-Defekte-100x71.jpeg 100w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Rosenbergerstecker-buchse-Defekte.jpeg 1647w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>A problem with the wiring, charger, battery, or controller (MCU)<\/li>\n\n\n\n<li>A problem with an external component (e.g. front light) due to a short circuit or defect<\/li>\n\n\n\n<li>E 21041C in combination with W 210100 can occur due to a deeply discharged battery. Deep discharge sometimes happens if you forget to check and possibly recharge the battery during a winter break or prolonged non-use of the e-bike. <\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Solution<\/h3>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-alert\">Clean the contacts\/socket with a lint-free cloth or compressed air.<br>Verwende keine Kontaktsprays, Fette, die \u00abAllzweckwaffe\u00bb WD-40-Multifunktions Smart-Straw oder mechanische Werkzeuge.<br><br>For corrosion on the socket or charging connector, use isopropyl alcohol and a fiberglass brush for cleaning.<br><br>Die Pins des Ladeger\u00e4tsteckers und der Akkufachbuchse sind gefedert und k\u00f6nnen durch mechanische Werkzeuge leicht besch\u00e4digt werden. Ist ein Pin defekt, muss die Buchse oder der Stecker ersetzt werden. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u00e4dt der Akku nur ausserhalb des Stromers und sind alle Kontakte sauber liegt der Fehler entweder bei der Verkabelung (z. B. Ladeanschluss im Oberrohr \/ Wicket Cable im Tretlagerbereich) oder einer fehlerhaften Komponente (Controller, Frontlicht&#8230;).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u00e4dt der Akku auch ausserhalb des Stromers nicht, ist das Ladeger\u00e4t oder der Akku defekt. Bei einem m\u00f6glichen Akkudefekt (z. B. Cell Drift) erscheint im Omni auch meist zus\u00e4tzlich der Fehler W 210100 oder E 21014A. Tausche testweise das Ladeger\u00e4t aus und schaue ob das Laden nun funktioniert. Wenn nein, pr\u00fcfe den Akku mit dem <a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/battery-self_check-recognize-problems\/\">Battery SELF_CHECK<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ist der Akku l\u00e4ngere Zeit nicht genutzt worden kann auch eine Tiefentladung vorliegen. Mit etwas Gl\u00fcck kann der Akku nach einem Reset wieder verwendet werden. Diesen kann die myStromerAG oder ein auf Stromer-Akkus spezialisierter <a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/repair-new-refit-refurbishing-occasionen\/\">Batterieaufbereiter<\/a> durchf\u00fchren.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Further links<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/check-wiring\/\" data-type=\"ht_kb\" data-id=\"827\">See<\/a> ELEKTRIK &amp; ELEKTRONIK - Testing \/ Checking - \u201a<em>Check wiring' <\/em><br><a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/sit-test-runner-components-test\/\">See<\/a>&nbsp;ELEKTRIK &amp; ELEKTRONIK - Testing \/ Checking - \u201a<em>SIT (Test Runner) - Testing components'<\/em> <br><a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/battery-self_check-recognize-problems\/\" data-type=\"ht_kb\" data-id=\"676\">See<\/a> ELEKTRIK &amp; ELEKTRONIK - Testing \/ Checking - \u201a<em>Battery SELF_CHECK - Recognize problems'<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>Problem Akku wird nicht geladen. Ladeanzeige blinkt bzw. leuchtet rot. Ursache L\u00f6sung L\u00e4dt der Akku nur ausserhalb des Stromers und sind alle Kontakte sauber liegt der Fehler entweder bei der Verkabelung (z. B. Ladeanschluss im Oberrohr \/ Wicket Cable im Tretlagerbereich) oder einer fehlerhaften Komponente (Controller, Frontlicht&#8230;). L\u00e4dt der Akku&#8230;<\/p>","protected":false},"author":1,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[136],"ht-kb-tag":[],"class_list":["post-664","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-fehler-und-warnmeldungen"],"_links":{"self":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/664","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=664"}],"version-history":[{"count":33,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/664\/revisions"}],"predecessor-version":[{"id":13033,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/664\/revisions\/13033"}],"wp:attachment":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/media?parent=664"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-category?post=664"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-tag?post=664"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}