{"id":2338,"date":"2015-12-06T22:13:56","date_gmt":"2015-12-07T03:13:56","guid":{"rendered":"http:\/\/protofusion.org\/wordpress\/?p=2338"},"modified":"2015-12-06T22:14:53","modified_gmt":"2015-12-07T03:14:53","slug":"tenergy-lifepo4-cr123-cell-test","status":"publish","type":"post","link":"http:\/\/protofusion.org\/wordpress\/2015\/12\/tenergy-lifepo4-cr123-cell-test\/","title":{"rendered":"Tenergy LiFePO4 CR123 Cell Test"},"content":{"rendered":"<p><a href=\"http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2015\/12\/lifecr123.jpg\" data-rel=\"lightbox-image-0\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2352\" src=\"http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2015\/12\/lifecr123-600x400.jpg\" alt=\"lifecr123\" width=\"550\" height=\"367\" srcset=\"http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2015\/12\/lifecr123-600x400.jpg 600w, http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2015\/12\/lifecr123-300x200.jpg 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/a><\/p>\n<p>I stumbled upon Tenergy&#8217;s lithium iron phosphate CR123 cells when looking for a fairly compact cylindrical rechargeable battery. The Tenergy RCR123A LiFePO4 cell, as listed on <a href=\"http:\/\/www.tenergy.com\/30200\" target=\"_blank\">Tenergy&#8217;s website<\/a>, supposedly has a nominal voltage of 3v and a nominal capacity of 750mAh. Both of these values seemed a bit unusual, so I ran the battery through a discharge test to get some realistic data on what this cell is capable of. Note that many consumer battery manufacturers publish capacity numbers that are more than 200% of the real-world value, so this isn&#8217;t a unique case.<\/p>\n<p><!--more--><\/p>\n<p>My test procedure was as follows:<\/p>\n<ul>\n<li>Discharge cell to 2.5v (no measurements taken)<\/li>\n<li>Charge CC\/CV @ 200mA to 3.6v, terminate charge at 2mA in CV<\/li>\n<li>Discharge on load bank to 2.5v at 100mA<\/li>\n<\/ul>\n<p>The following test was conducted after putting the cell through two charge\/discharge cycles.<\/p>\n<p><a href=\"http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2015\/12\/discharge3-e1449457619623.png\" data-rel=\"lightbox-image-1\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-2346 size-large\" src=\"http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2015\/12\/discharge3-e1449457619623-600x340.png\" alt=\"\" width=\"550\" height=\"312\" srcset=\"http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2015\/12\/discharge3-e1449457619623-600x340.png 600w, http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2015\/12\/discharge3-e1449457619623-300x170.png 300w, http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2015\/12\/discharge3-e1449457619623.png 712w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/a><\/p>\n<p>The plot above shows the discharge curve for this battery, which resembles the typical discharge curve for a LiFePO4 cell. When discharging at 100mA, the realized capacity was 426mAh. While this is well below the rated capacity, it is a reasonable value for a cell of this size and chemistry. You can also see that the nominal voltage is well above 3v. Typical LiFePO4 cells have a nominal voltage of 3.2v, and this cell is no different. Under a heavy 100mA load, the cell remained at around 3.15V for the duration of the discharge. I repeated this test with 50mA and 10mA loads and the measured capacity was within 10mA of the results included above.<\/p>\n<p>Plot data is <a href=\"http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2015\/12\/discharge3.csv\">available for download<\/a> if you want to take a closer look.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I stumbled upon Tenergy&#8217;s lithium iron phosphate CR123 cells when looking for a fairly compact cylindrical rechargeable battery. The Tenergy RCR123A LiFePO4 cell, as listed on Tenergy&#8217;s website, supposedly has a nominal voltage of 3v and a nominal capacity of<span class=\"ellipsis\">&hellip;<\/span><\/p>\n<div class=\"read-more\"><a href=\"http:\/\/protofusion.org\/wordpress\/2015\/12\/tenergy-lifepo4-cr123-cell-test\/\">Read more &#8250;<\/a><\/div>\n<p><!-- end of .read-more --><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kadence_starter_templates_imported_post":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[35],"tags":[272,269,270,271],"class_list":["post-2338","post","type-post","status-publish","format-standard","hentry","category-projects","tag-battery","tag-cr123","tag-lifepo4","tag-lithium-iron-phosphate"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pNjAs-BI","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/posts\/2338","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/comments?post=2338"}],"version-history":[{"count":14,"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/posts\/2338\/revisions"}],"predecessor-version":[{"id":2358,"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/posts\/2338\/revisions\/2358"}],"wp:attachment":[{"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/media?parent=2338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/categories?post=2338"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/tags?post=2338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}