{"id":108,"date":"2020-11-16T16:29:25","date_gmt":"2020-11-17T00:29:25","guid":{"rendered":"https:\/\/denco.ad6dm.net\/batts\/?p=108"},"modified":"2020-11-17T15:11:04","modified_gmt":"2020-11-17T23:11:04","slug":"denco-rexco-2","status":"publish","type":"post","link":"https:\/\/denco.ad6dm.net\/batts\/denco-rexco-2\/","title":{"rendered":"DenCo\/RexCo 2"},"content":{"rendered":"\n<p>This battery was a design conceived by KE6MT after he received the Mk IV battery from me. Rex drew up a flat pack 4S2P design that I would spot weld for him, and he would complete.<\/p>\n\n\n\n<p>Rex later went on a deep dive creating an Arduino-based cell monitor showing each 2P combination&#8217;s voltage for the 4 in series.<\/p>\n\n\n\n<p><strong>General Specs:<\/strong><br>Created: November 2019.<br>Cells: LiitoKala 32700 7Ah 3.2v LiFePO4.<br>BMS: HX-4S-F100A.<br>Configuration: 4S2P.<br>New since last make: Flat unfinished build, only connections spot-welded, and parts provided (BMS).<br>Current Owner: <a rel=\"noreferrer noopener\" href=\"https:\/\/twitter.com\/rex_ke6mt\/\" target=\"_blank\">KE6MT Rex<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"705\" src=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/4S2P-battery-idea-lil-1024x705.png\" alt=\"\" class=\"wp-image-109\" srcset=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/4S2P-battery-idea-lil-1024x705.png 1024w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/4S2P-battery-idea-lil-300x207.png 300w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/4S2P-battery-idea-lil-768x529.png 768w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/4S2P-battery-idea-lil-1536x1057.png 1536w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/4S2P-battery-idea-lil-2048x1410.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Rex&#8217;s drawing of the cell configuration for 4S2P in a flat setup.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-gallery columns-3 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS9-1024x768.jpg\" alt=\"\" data-id=\"110\" data-full-url=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS9-scaled.jpg\" data-link=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=110\" class=\"wp-image-110\" srcset=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS9-1024x768.jpg 1024w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS9-300x225.jpg 300w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS9-768x576.jpg 768w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS9-1536x1152.jpg 1536w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS9-2048x1536.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS8-768x1024.jpg\" alt=\"\" data-id=\"111\" data-full-url=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS8-scaled.jpg\" data-link=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=111\" class=\"wp-image-111\" srcset=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS8-768x1024.jpg 768w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS8-225x300.jpg 225w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS8-1152x1536.jpg 1152w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS8-1536x2048.jpg 1536w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/Image-from-iOS8-scaled.jpg 1920w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/image_from_ios-1024x768.jpg\" alt=\"\" data-id=\"112\" data-full-url=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/image_from_ios-scaled.jpg\" data-link=\"https:\/\/denco.ad6dm.net\/batts\/?attachment_id=112\" class=\"wp-image-112\" srcset=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/image_from_ios-1024x768.jpg 1024w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/image_from_ios-300x225.jpg 300w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/image_from_ios-768x576.jpg 768w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/image_from_ios-1536x1152.jpg 1536w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/image_from_ios-2048x1536.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p><strong>Cell specs:<\/strong><br>LiitoKala 32700 cells<br>Nominal Capacity: 7Ah (6.5Ah in practical use)<br>Nominal Voltage: 3.2V per cell<br>Dimensions: 32mm x 70 mm<br>Weight: 145g per cell<br>Internal resistance: less than 8 m\u03a9<br>Cycle life: > 2000 cycles, DOD at 80%<br>Input charging voltage: 3.65v\/cell<br>Input charging current: 3A<br>Continuous discharge current: 30A<br>Max discharge current (pulse): 6C<br>Discharge cut-off voltage: 2.5V<br>Charging temp: 0-45\u00b0C<br>Discharge temp: -20\u00b0C \u2013 60\u00b0C<br>Storage temp: -20\u00b0C \u2013 45\u00b0C<\/p>\n\n\n\n<p><strong>BMS Specs:<\/strong><br>HX-4S-F100A BMS<br>1. Continuous discharge current: 100A<br>2. Instantaneous discharge current: 120A<br>3. Charging Voltage: Iron lithium charger 14.8V (Switching power supply: 15V-16V)<br>4. Charging Current: 10A(Max)<br>5. Overcharge detection voltage: 3.75V\u00b10.05V<br>6. Over charge detection delay time: 1300 ms<br>7. Over charge release voltage: 3.6V\u00b10.05V<br>8. Electricity equalization detection voltage: 3.6V\u00b10.05V<br>9. Electricity equalization release voltage: 3.59V\u00b10.05V<br>10. Electricity equalization current: 58mA<br>11. Over discharge detection voltage: 2.1V\u00b10.08V<br>12. Over discharge detection delay time: 145s<br>13. Over discharge release voltage: 2.30V\u00b10.1V<br>14. Over current detection voltage: 200mV<br>15. Over current detection delay time: 20mS<br>16. Over current protection current: 120A\u00b110A<br>17. Over current protection release: Cut off the load<br>18. Detection condition: Exterior load short circuit<br>19. Detection delay time: 300us<br>20. Over current protection: Cut off the load<br>21. Temperature Protection: Can use an external temperature switch<br>22. Main circuit conduction resistance ~20m\u03a9<br>23. Working current: ~30uA<br>24. Working Temperature: -20\u00b0C to 80\u00b0C<br>25. Size: 70 x 60 x 8.5mm<\/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_denco_rexco_2.png\" alt=\"\" class=\"wp-image-269\" srcset=\"https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/qr_denco_rexco_2.png 200w, https:\/\/denco.ad6dm.net\/batts\/wp-content\/uploads\/2020\/11\/qr_denco_rexco_2-150x150.png 150w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"<p>This battery was a design conceived by KE6MT after he received the Mk IV battery from me. Rex drew up a flat pack 4S2P design that I would spot weld for him, and he would complete. Rex later went on a deep dive creating an Arduino-based cell monitor showing each 2P combination&#8217;s voltage for the &hellip;<\/p>\n<p class=\"read-more\"> <a class=\" thunk-readmore button \" href=\"https:\/\/denco.ad6dm.net\/batts\/denco-rexco-2\/\"> <span class=\"screen-reader-text\">DenCo\/RexCo 2<\/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-108","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\/108","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=108"}],"version-history":[{"count":4,"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/posts\/108\/revisions"}],"predecessor-version":[{"id":271,"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/posts\/108\/revisions\/271"}],"wp:attachment":[{"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/media?parent=108"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/categories?post=108"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/denco.ad6dm.net\/batts\/wp-json\/wp\/v2\/tags?post=108"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}