{"id":783,"date":"2025-07-03T22:30:11","date_gmt":"2025-07-03T20:30:11","guid":{"rendered":"https:\/\/wp.stromer-tech.info\/?post_type=ht_kb&p=783"},"modified":"2026-02-12T21:58:23","modified_gmt":"2026-02-12T20:58:23","slug":"self-discharge-of-a-bq983-battery","status":"publish","type":"ht_kb","link":"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/selbstentladung-eines-bq983-akkus\/","title":{"rendered":"Self-discharge of a BQ983 battery"},"content":{"rendered":"

Test setup<\/h3>\n\n\n\n

As a test, I stored a new BQ983 battery outside the Stromer at 18 - 22 \u00b0C. The capacity was calculated using the measured voltage (unloaded) at the output of the CR245 charger and based on a standard charging curve U\/% for Li-ion batteries. <\/p>\n\n\n\n

\"\"
(c) Fundamentals of electromobility | Martin Doppelbaier, Electrotechnical Institute, KIT Karlsruhe Institute of Technology, Karlsruhe, Germany | EBook<\/figcaption><\/figure>\n\n\n\n

Compared with the Omni reading, there was a deviation of around 8-10 %, which is why I only started the measurement at 89 %. The measurement period was 21 months.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Even if the individual measuring points do not correspond with the 100%-ig omni display, a clear statement can be made.

The self-discharge rate is approx. 1 % per week or 4 % per month.<\/strong><\/p>\n\n\n\n

See<\/a> also AKKU - ,Bearing with floating charge CR246 (CR65)\u2018<\/em><\/p>\n\n\n\n

Self-discharge in general<\/h3>\n\n\n\n

Current data on the so-called self-discharge of Li-ion batteries (not individual cells) is 3 - 4 % per month at room temperature, depending on the BMS. This is almost identical to my test above.<\/p>\n\n\n\n

<\/p>","protected":false},"excerpt":{"rendered":"

Testaufbau Testweise habe ich einen neuen BQ983 Akku ausserhalb des Stromers bei 18 – 22 \u00b0C gelagert. Die Kapazit\u00e4t wurde anhand der gemessenen Spannung (unbelastet) am Ausgang des CR245 Ladeger\u00e4ts und aufgrund einer Standardladekurve U\/% f\u00fcr Li-Ionenakkus berechnet. Verglichen mit der Omnianzeige ergab sich eine Abweichung von etwa 8-10 %,…<\/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-783","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\/783","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=783"}],"version-history":[{"count":7,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/783\/revisions"}],"predecessor-version":[{"id":8979,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/783\/revisions\/8979"}],"wp:attachment":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/media?parent=783"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-category?post=783"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-tag?post=783"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}