{"id":6618,"date":"2025-03-15T07:42:33","date_gmt":"2025-03-15T07:42:33","guid":{"rendered":"https:\/\/rcpress.com\/wp\/?p=6618"},"modified":"2025-05-13T10:55:35","modified_gmt":"2025-05-13T10:55:35","slug":"2s-lipo-cannot-take-charge","status":"publish","type":"post","link":"http:\/\/rcpress.com\/wp\/?p=6618","title":{"rendered":"2S lipo cannot take charge"},"content":{"rendered":"

\"\"<\/a><\/p>\n

 <\/p>\n

A 7.4V 2S LiPo battery consists of two 3.7V cells connected in series. If one cell is unable to take charge and rapidly drops to zero voltage after charging, it is likely due to severe damage or internal failure. One of the most common reasons for this issue is an internal short circuit within the cell. This can happen due to physical damage, excessive swelling, or manufacturing defects, causing the affected cell to lose charge immediately after being disconnected from the charger.<\/p>\n

Another possible cause is over-discharge damage. If the battery was discharged below 3.0V per cell, one of the cells might have suffered permanent damage. LiPo cells do not recover once they have been deeply discharged, leading to a failure where one of the cells stops functioning properly.<\/p>\n

Cell imbalance and aging also play a role in this issue. Over time, LiPo cells degrade at different rates. If one cell has aged significantly more than the other, it may lose capacity and become unable to hold charge effectively. Even if the battery is charged, the weaker cell depletes much faster, eventually reaching zero voltage while the healthier cell still retains charge.<\/p>\n

Another possibility is a faulty Battery Management System (BMS) or balancer circuit. Some LiPo packs have a built-in balancing system to ensure even charging of both cells. If this circuit fails, it may cause one of the cells to become overcharged or undercharged, leading to a complete failure of the weaker cell.<\/p>\n

The issue can also stem from an increase in internal resistance within the faulty cell. A cell with very high internal resistance will struggle to accept or hold charge, creating a situation where it appears to charge normally but experiences a rapid voltage collapse as soon as a load is applied.<\/p>\n

To confirm the problem, measuring the individual cell voltages with a LiPo checker or multimeter before and after charging is necessary. If one cell consistently drops to near zero while the other remains stable, the damaged cell is beyond recovery. In most cases, replacing the entire battery pack is the only safe solution, as continuing to use a faulty LiPo battery can pose a fire hazard or cause further damage to connected electronics.<\/p>\n","protected":false},"excerpt":{"rendered":"

  A 7.4V 2S LiPo battery consists of two 3.7V cells connected in series. If one cell is unable to take charge and rapidly drops to zero voltage after charging, it is likely due to severe damage or internal failure. One of the most common reasons for this issue is an internal short circuit within […]<\/p>\n","protected":false},"author":1,"featured_media":6619,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[122],"tags":[],"_links":{"self":[{"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/6618"}],"collection":[{"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6618"}],"version-history":[{"count":3,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/6618\/revisions"}],"predecessor-version":[{"id":6908,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/6618\/revisions\/6908"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=\/wp\/v2\/media\/6619"}],"wp:attachment":[{"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6618"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6618"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/rcpress.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}