{"id":1542,"date":"2025-07-08T19:36:10","date_gmt":"2025-07-08T17:36:10","guid":{"rendered":"https:\/\/wp.stromer-tech.info\/?post_type=ht_kb&#038;p=1542"},"modified":"2026-09-19T12:46:52","modified_gmt":"2026-09-19T10:46:52","slug":"battery-does-not-deep-discharge","status":"publish","type":"ht_kb","link":"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/akku-laedt-nicht-tiefentladen\/","title":{"rendered":"Battery not charging - deep discharged?"},"content":{"rendered":"<p class=\"wp-block-paragraph\" id=\"843e33e2-ca6b-45ce-bfcf-dafd1ec77ab7\">Wenn der Akku nicht mehr geladen werden kann ist die Ursache manchmal eine sog. Tiefentladung. Dies passiert meist aus zwei Gr\u00fcnden.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Grund 1:<\/strong> Der Akku wird unsachgem\u00e4ss, meist mit zu geringem Ladestand, in die Winterpause geschickt und\/oder falsch gelagert. Wie das verhindert werden kann steht in den <a href=\"https:\/\/cdn.sanity.io\/files\/odfp6kjd\/production\/a09491ee3e3fb2a85d1a1f539a2cf9dad15ecdd2.pdf\">Safety instructions<\/a> to the battery, the <a href=\"https:\/\/www.stromerbike.com\/de\/support\/manuals\">Operating instructions<\/a>&nbsp;or under BATTERY \u2013&nbsp;<em><a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/mechanical-maintenance-in-operation-storage-safety\/\">'Care: Mechanical \/ in operation \/ storage \/ safety'<\/a><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Stromer writes the following regarding storage:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1330\" height=\"1482\" src=\"https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Lagerung_des_Akkus.jpeg\" alt=\"\" class=\"wp-image-10567\" style=\"width:600px;height:auto\" srcset=\"https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Lagerung_des_Akkus.jpeg 1330w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Lagerung_des_Akkus-269x300.jpeg 269w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Lagerung_des_Akkus-919x1024.jpeg 919w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Lagerung_des_Akkus-768x856.jpeg 768w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Lagerung_des_Akkus-45x50.jpeg 45w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Lagerung_des_Akkus-11x12.jpeg 11w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Lagerung_des_Akkus-54x60.jpeg 54w, https:\/\/wp.stromer-tech.info\/wp-content\/uploads\/2025\/07\/Stromer_Lagerung_des_Akkus-90x100.jpeg 90w\" sizes=\"auto, (max-width: 1330px) 100vw, 1330px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>Grund 2:<\/strong> Eine eher unwahrschinliche Variante ist, dass der Stromer unabsichtlich in den Diebstahlmodus versetzt wird. Schiebt man den Stromer nur 2 bis 3 m schaltet dieser in den Diebstahlmodus. Der Stromer meldet dies durch Blinken des Tagfahrlichts und durch Huoen, falls dies in den Einstellungen so einegestellt ist. Weiter wird eine E-Mail an den mit dem Stromer verbundenen Account gesendet. Im Diebstahlmodus verbraucht der Stromer aufgrund der nun permanenten GPS-Ortung wesentlich mehr Energie. Ein voller BQ983 Akku ist in etwa 10 Tagen leer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why does deep discharge happen, can it be prevented?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Self-discharge is a physiochemical process that <strong>fundamentally unstoppable<\/strong> Each individual cell in a Li-ion battery experiences self-discharge due to its chemistry. These processes occur even without any external circuitry \u2013 purely internally within the cell. This self-discharge is called calendar aging. It arises from several mechanisms:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Electrochemical side reactions at the electrodes (e.g., SEI layer growth)<\/li>\n\n\n\n<li>Ion diffusion through the separator<\/li>\n\n\n\n<li>Parasitic leakage currents within the cell itself<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In a battery pack, several cells and the BMS are connected. Even a modern BMS consumes standby power, around 10\u201350 \u00b5A, so it's an additional consumer on top. It doesn't \u201esee\u201c the internal cell currents because they don't flow through external wires.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When a lithium-ion battery <strong>stored long enough<\/strong> wird (Monate bis Jahre), sinkt die Spannung irgendwann unweigerlich unter den kritischen Spannungswert von 2,5 V \u2013 besonders wenn:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The storage temperature is high (greatly accelerates self-discharge)<\/li>\n\n\n\n<li>The BMS itself draws power (typically 20\u2013100 \u00b5A)<\/li>\n\n\n\n<li>The cells are already aged<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"4b9cc764-d59c-4bf3-8a27-601b1f081f74\">This leads to irreversible damage, loss of capacity, and a potential fire hazard due to internal short circuits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A good BMS, correct handling, and storage can delay but not prevent deep discharge if no counter-measures are taken.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"3557f348-ed0d-4a4a-8968-c0e4a34a65ca\">You can find more details on this in my compendium on Li-ion batteries under AKKU - <em><a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/theory-concept-compendium-on-the-li-ion-battery\/\" data-type=\"ht_kb\" data-id=\"2547\">'Theory &amp; terminology compendium for Li-ion batteries'<\/a><\/em> read more. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Was sagt Stromer zum Thema &#8222;Tiefentladung&#8220;? <a href=\"https:\/\/www.stromerbike.com\/de\/support\/faq\/battery\/what-is-a-deep-discharge\">See<\/a> folgenden FAQ-Eintrag.<\/p>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\">The <a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/self-discharge-of-a-bq983-battery\/\" data-type=\"ht_kb\" data-id=\"783\">Self-detonation<\/a> eines Stromer BQ983 Akkus liegt bei sachgem\u00e4sser Lagerung ausserhalb des Stromers bei <strong>~1% per week<\/strong>&nbsp;or <strong>~4% per month<\/strong>. <br><br>Erreicht der Stromerakku die kritische Spannungsschwelle (ca. 3.0 V \/ Zelle) wird zuerst der Stromer automatsich abgeschaltet (ab FW 4.3.8.5 vom 16.3.2022). Sinkt die Spannung weiter, geht der Akku in einen Tiefschlafmodus und die Schutzschaltung springt an. Sie verlangsamt die weitere Entladung drastisch, so dass die kritsiche Grenze von 2.5 V \/ Zelle weiter hinausgez\u00f6gert wird.<br><br><a href=\"https:\/\/www.stromerbike.com\/de\/support\/faq\/battery\/how-do-i-wake-up-a-stromer-bike-from-deep-sleep-mode\">See<\/a> auch die Stromer FAQ: Wie wache ich ein Stromer-Bike aus dem Deep Sleep Modus auf?<\/p>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-danger\">On YouTube, videos are shown on how to revive a deeply discharged battery. Such a \u201ezombie battery\u201c is unstable, a fire hazard, and a safety risk. <strong>This is strongly discouraged<\/strong>!<\/p>\n\n\n\n<h3 id=\"62736601-761a-4ad1-8933-402496e8114c\" class=\"wp-block-heading\">What can you do with a Stromer if the battery can no longer be charged?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"99909a17-c0ea-4bd5-9594-94a093b6efae\">The following points can still be tried without security risks before a new battery becomes necessary.<\/p>\n\n\n\n<ul id=\"5e9e382e-09ce-402c-8386-e023b89ee6db\" class=\"wp-block-list\">\n<li>With a bit of luck, a battery may only appear to be deeply discharged, with the cell voltage still above the critical 2.5V but below 3.2V. Above 3.2V, a Li-ion cell is considered empty (0% capacity). This threshold is relevant for most chargers. They will not charge the battery for safety reasons if the voltage drops below 3.2V.<br><br>The Stromer charger CR245 (&amp; CR65) has a hidden capability. It can revive such a battery, if necessary. This is referred to as \u00abnurturing.\u00bb. <br><strong>Verbinde den Akku mit dem Ladeger\u00e4t und ziehe den Ladestecker nach 30 Sekunden wieder ab. Wiederhole das Prozedre mehrere male und beobachte die Ladeanzeige des Ladeger\u00e4ts. <\/strong>Mit etwas Gl\u00fcck beginnt das Ladeger\u00e4t dem regul\u00e4ren Ladevorgang. Wenn nicht lasse das ladeger\u00e4t 1 &#8211; 2 Tage am Akku angeschlossen. <br><br>Das neuere CR246 hat diese \u00abAufp\u00e4ppelfunktion\u00bb nicht, daf\u00fcr bietet es eine \u00abSchwebeladung\u00bb an.<\/li>\n\n\n\n<li>One can no further <strong>Send the battery to Stromer via the dealer<\/strong>. Stromer doesn't repair batteries, but they can reset the self-protection and reactivate the battery. The same applies here: if the cell voltage has dropped below 2.5 V, Stromer will no longer reactivate the battery.<\/li>\n\n\n\n<li>As <strong>last chance<\/strong> Is there still the <strong>Battery replacement<\/strong>. However, the respective company must offer the option to reset the SoH and charge cycle counter. And a reset is only possible with HTE batteries with 3 screws.<br>Further information can be found at AKKU -&nbsp;<em><a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/repair-new-refit-refurbishing-occasionen\/\">\u201aRepair \/ Battery Refurbishing \/ Used Items\u2018<\/a><\/em><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The typical self-discharge rate of a Li-ion battery at room temperature is about <strong>1\u20133 % pro Monat<\/strong> (Stromer = 4%, see above). At 20\u00b0C and with a properly stored battery, it therefore takes <strong>many months to years<\/strong>, until the critical cell voltage limit of 2.5 V is reached.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tips for Long-Term Storage:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Charge level at ~40\u201360 %<\/strong> store (not full, not empty)<\/li>\n\n\n\n<li><strong>Store in a cool place<\/strong> (10\u201315\u00b0C ideal) \u2013 significantly slows down the chemistry<\/li>\n\n\n\n<li><strong>Battery management system with sleep mode<\/strong> choose one that reduces self-consumption to &lt;5 \u00b5A<\/li>\n\n\n\n<li><strong>Reload periodically<\/strong> (every 3\u20136 months) or use the CR246 with floating charge.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\">The BMS protects the cell from the <em>Damages<\/em> through deep discharge (by disconnecting the consumer in time), but cannot prevent the chemical-physical self-discharge of the cells. <br><br><strong>Anyone storing a battery for a very long time must therefore check and recharge it regularly.<\/strong><br><br>An alternative is to connect the battery to the CR65 or CR246 charger. Both models allow for float charging.<\/p>","protected":false},"excerpt":{"rendered":"<p>Wenn der Akku nicht mehr geladen werden kann ist die Ursache manchmal eine sog. Tiefentladung. Dies passiert meist aus zwei Gr\u00fcnden. Grund 1: Der Akku wird unsachgem\u00e4ss, meist mit zu geringem Ladestand, in die Winterpause geschickt und\/oder falsch gelagert. Wie das verhindert werden kann steht in den Sicherheithinweisen zum Akku,&#8230;<\/p>","protected":false},"author":1,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[201],"ht-kb-tag":[],"class_list":["post-1542","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-p-akku-batterie"],"_links":{"self":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/1542","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=1542"}],"version-history":[{"count":68,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/1542\/revisions"}],"predecessor-version":[{"id":13571,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/1542\/revisions\/13571"}],"wp:attachment":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/media?parent=1542"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-category?post=1542"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-tag?post=1542"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}