{"id":4653,"date":"2023-11-05T16:33:46","date_gmt":"2023-11-05T15:33:46","guid":{"rendered":"https:\/\/truefork.org\/wp\/?p=4653"},"modified":"2023-11-05T16:33:46","modified_gmt":"2023-11-05T15:33:46","slug":"w-4-p-polish-mine-detector-battery-substitute","status":"publish","type":"post","link":"https:\/\/truefork.org\/wp\/w-4-p-polish-mine-detector-battery-substitute\/","title":{"rendered":"W-4-P Polish Mine Detector battery substitute"},"content":{"rendered":"\n<p>The W4P Polish military metal detector was powered by a 3R12U tin-carbon battery that is not available in retail, but it can be substituted with 3 AA batteries in series. <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105134755.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"473\" src=\"https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105134755.jpg\" alt=\"\" class=\"wp-image-4654\" srcset=\"https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105134755.jpg 1024w, https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105134755-300x139.jpg 300w, https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105134755-768x355.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p>To keep the batteries together I used 2 pieces of plastic tubing (leftover electrical conduit), both 142mm long, the outer one a 20mm diameter, and a 16mm diameter one that I split lengthwise to keep the AA batteries together through tension. <\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105133241.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"816\" data-id=\"4655\" src=\"https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105133241.jpg\" alt=\"\" class=\"wp-image-4655\" srcset=\"https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105133241.jpg 1024w, https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105133241-300x239.jpg 300w, https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105133241-768x612.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105133304.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"783\" data-id=\"4656\" src=\"https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105133304.jpg\" alt=\"\" class=\"wp-image-4656\" srcset=\"https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105133304.jpg 1024w, https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105133304-300x229.jpg 300w, https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105133304-768x587.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/figure>\n\n\n\n<p>I added some holes to reduce the tension to a snug fit but not too hard to insert and remove the batteries. <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105134754.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"740\" src=\"https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105134754.jpg\" alt=\"\" class=\"wp-image-4657\" srcset=\"https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105134754.jpg 1024w, https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105134754-300x217.jpg 300w, https:\/\/truefork.org\/wp\/wp-content\/uploads\/2023\/11\/IMG20231105134754-768x555.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p>The resulting compound battery doesn&#8217;t have the same length as a 3R12U, so I added a spring from a D-cell flashlight (these are available as spare parts for brands like Maglite).<\/p>\n\n\n\n<p>Note: the cap side is -, the + side of the battery goes in first. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>The W4P Polish military metal detector was powered by a 3R12U tin-carbon battery that is not available in retail, but it can be substituted with 3 AA batteries in series. To keep the batteries together I used 2 pieces of plastic tubing (leftover electrical conduit), both 142mm long, the outer one a 20mm diameter, and [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":4658,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[10,9],"class_list":["post-4653","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-artifacts","tag-panoply","tag-tutorial","entry","has-media"],"_links":{"self":[{"href":"https:\/\/truefork.org\/wp\/wp-json\/wp\/v2\/posts\/4653","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/truefork.org\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/truefork.org\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/truefork.org\/wp\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/truefork.org\/wp\/wp-json\/wp\/v2\/comments?post=4653"}],"version-history":[{"count":0,"href":"https:\/\/truefork.org\/wp\/wp-json\/wp\/v2\/posts\/4653\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/truefork.org\/wp\/wp-json\/wp\/v2\/media\/4658"}],"wp:attachment":[{"href":"https:\/\/truefork.org\/wp\/wp-json\/wp\/v2\/media?parent=4653"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/truefork.org\/wp\/wp-json\/wp\/v2\/categories?post=4653"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/truefork.org\/wp\/wp-json\/wp\/v2\/tags?post=4653"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}