{"id":145,"date":"2020-11-16T18:30:23","date_gmt":"2020-11-17T02:30:23","guid":{"rendered":"https:\/\/denco.ad6dm.net\/batts\/?p=145"},"modified":"2020-11-17T10:23:12","modified_gmt":"2020-11-17T18:23:12","slug":"denco-qrp-batt-mk-i","status":"publish","type":"post","link":"https:\/\/denco.ad6dm.net\/batts\/denco-qrp-batt-mk-i\/","title":{"rendered":"DenCo QRP Batt Mk I"},"content":{"rendered":"\n<p>I have a small cube-like 3Ah LiFePO4 battery from a commercial manufacturer popular with hams these days. I used it mostly with the KX3 on trips. <\/p>\n\n\n\n<p>I saw that the K2 26650&#8217;s could be arranged in a 2&#215;2 fashion to create the exact same form factor. Couple that with a newly discovered tiny protection board, and I conceived of a way to make a similar battery (which is good since the original commercial battery is no longer produced).<\/p>\n\n\n\n<p><strong>General Specs:<\/strong><br>Created: March 1, 2020.<br>Cells: K2 26650 2.85Ah 3.2v LiFePO4 (capable of 150A pulse max).<br>BMS: HX-4S-3828 LiFePO4 BMS PCB Board for 26650 or 18650 LiFePO4.<br>Configuration: 4S1P.<br>Total Rated Capacity: 2.85Ah.<br>Current Owner: <a rel=\"noreferrer noopener\" href=\"https:\/\/www.youtube.com\/channel\/UCHriEQX4EK2b0QS7EgSvjmg\" target=\"_blank\">NJ7V Charlie<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6695-1024x768.jpg\" alt=\"\" class=\"wp-image-146\" srcset=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6695-1024x768.jpg 1024w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6695-300x225.jpg 300w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6695-768x576.jpg 768w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6695-1536x1152.jpg 1536w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6695-2048x1536.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-gallery columns-2 wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=147\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6702-768x1024.jpg\" alt=\"\" data-id=\"147\" data-link=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=147\" class=\"wp-image-147\" srcset=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6702-768x1024.jpg 768w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6702-225x300.jpg 225w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6702-1152x1536.jpg 1152w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6702-1536x2048.jpg 1536w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6702-scaled.jpg 1920w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=148\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6704-768x1024.jpg\" alt=\"\" data-id=\"148\" data-link=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=148\" class=\"wp-image-148\" srcset=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6704-768x1024.jpg 768w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6704-225x300.jpg 225w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6704-1152x1536.jpg 1152w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6704-1536x2048.jpg 1536w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6704-scaled.jpg 1920w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<figure class=\"wp-block-gallery columns-3 is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=149\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6711-Edited-1024x768.jpg\" alt=\"\" data-id=\"149\" data-full-url=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6711-Edited-scaled.jpg\" data-link=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=149\" class=\"wp-image-149\" srcset=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6711-Edited-1024x768.jpg 1024w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6711-Edited-300x225.jpg 300w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6711-Edited-768x576.jpg 768w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6711-Edited-1536x1152.jpg 1536w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6711-Edited-2048x1536.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=150\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6715-1024x768.jpg\" alt=\"\" data-id=\"150\" data-full-url=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6715-scaled.jpg\" data-link=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=150\" class=\"wp-image-150\" srcset=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6715-1024x768.jpg 1024w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6715-300x225.jpg 300w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6715-768x576.jpg 768w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6715-1536x1152.jpg 1536w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6715-2048x1536.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=151\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6717-1024x768.jpg\" alt=\"\" data-id=\"151\" data-full-url=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6717-scaled.jpg\" data-link=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=151\" class=\"wp-image-151\" srcset=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6717-1024x768.jpg 1024w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6717-300x225.jpg 300w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6717-768x576.jpg 768w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6717-1536x1152.jpg 1536w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/IMG_6717-2048x1536.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<figure class=\"wp-block-embed-twitter wp-block-embed is-type-rich is-provider-twitter\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"twitter-tweet\" data-width=\"550\" data-dnt=\"true\"><p lang=\"en\" dir=\"ltr\">I made my own 3Ah <a href=\"https:\/\/twitter.com\/hashtag\/QRP?src=hash&amp;ref_src=twsrc%5Etfw\">#QRP<\/a> battery out of 26650 <a href=\"https:\/\/twitter.com\/hashtag\/LiFePO4?src=hash&amp;ref_src=twsrc%5Etfw\">#LiFePO4<\/a> cells. Final product pictured with the old Bioenno 3Ah batt that goes everywhere with my KX3. <a href=\"https:\/\/twitter.com\/hashtag\/hamradio?src=hash&amp;ref_src=twsrc%5Etfw\">#hamradio<\/a> <a href=\"https:\/\/twitter.com\/hashtag\/DIY?src=hash&amp;ref_src=twsrc%5Etfw\">#DIY<\/a> <a href=\"https:\/\/t.co\/HYc2gSZCFe\">pic.twitter.com\/HYc2gSZCFe<\/a><\/p>&mdash; AD6DM Dennis (@AD6DM) <a href=\"https:\/\/twitter.com\/AD6DM\/status\/1233933929729519617?ref_src=twsrc%5Etfw\">March 1, 2020<\/a><\/blockquote><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script>\n<\/div><\/figure>\n\n\n\n<p><strong>Cell Specs:<\/strong><br>Brand: K2<br>Model: LFP26650P<br>Capacity: 2850mah<br>Watt Hours: 9.4<br>Nominal Voltage: 3.2<br>Fully Charged Voltage: 3.65 (recommended), 4.1 (maximum)<br>Fully Discharged Voltage: 2.5 (recommended), 2.0 (maximum)<br>Continuous Discharge (A): 42<br>Pulse 30 Seconds Discharge (A): 50<br>Short Pulse Discharge (A): 150<br>Charge Current (A): 5<\/p>\n\n\n\n<p><strong>BMS Specs:<\/strong><br>This board does NOT BALANCE.<br>Model: HX-4S-3828<br>Module size: 38 x 28 x 3.8mm \/ 1.49 x 1.10 x 0.15 inch<br>Upper limit working current: 8A<br>Upper limit instantaneous current: 20A<br>Over charge voltage range: 3.65\u00b10.05V<br>Over discharge voltage range: 2.35V\u00b10.05V<br>Static current: &lt;30uA<br>Charge voltage: 14.4V-15 V<br>Short circuit protection: yes. Delay self recovery<br>Tips: After the wiring is successful, the board needs to be charged and activated before it has output.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"200\" height=\"200\" src=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/qr_qrp_batt_mk_1.png\" alt=\"\" class=\"wp-image-244\" srcset=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/qr_qrp_batt_mk_1.png 200w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/qr_qrp_batt_mk_1-150x150.png 150w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/figure><\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I have a small cube-like 3Ah LiFePO4 battery from a commercial manufacturer popular with hams these days. I used it mostly with the KX3 on trips. I saw that the K2 26650&#8217;s could be arranged in a 2&#215;2 fashion to create the exact same form factor. Couple that with a newly discovered tiny protection board, &hellip;<\/p>\n<p class=\"read-more\"> <a class=\" thunk-readmore button \" href=\"https:\/\/denco.ad6dm.net\/batts\/denco-qrp-batt-mk-i\/\"> <span class=\"screen-reader-text\">DenCo QRP Batt Mk I<\/span>Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-145","post","type-post","status-publish","format-standard","hentry","category-lifepo4-batteries"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/posts\/145","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/comments?post=145"}],"version-history":[{"count":5,"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/posts\/145\/revisions"}],"predecessor-version":[{"id":246,"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/posts\/145\/revisions\/246"}],"wp:attachment":[{"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/media?parent=145"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/categories?post=145"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/tags?post=145"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}