To test battery, I need a small device to consume power. There are two kind of chips that able to do this trick.\u00a0YX8018 and\u00a0QX5252.<\/p>\n Datasheet: How To: Pros: YX8018 can run with a power source under 0.6v (maybe 0.5v is possible) under a LED load.\u00a0\u00a0YX8018 can go as low as 3mA (from power source) when pair with a high\u00a0560uH\u00a0inductor, which is good for weak power source (battery with high internal resistance).<\/p>\n Cons:\u00a0\u00a0YX8018 will not able to withdraw more than 30mA from power source. Since this is a step up boost converter, the load (LED, etc.) side will have even less current (~10mA).<\/p>\n I use\u00a0YX8018 for Salt Aluminum Battery load test, since the battery cannot withdraw much current.<\/p>\n Prototype: 560uH\u00a0inductor, 1.25v Power source. Datasheet: Pros: QX5252 can draw much more power from power source (300mA).<\/p>\n <\/p>\n To be continued …<\/p>\n <\/p>\n <\/p>\n Good Stuff:<\/p>\n https:\/\/skootsone.yolasite.com\/solar-led.php Step 1: Make a simple\u00a0Salt Aluminum Battery How to:\u00a0https:\/\/www.exploratorium.edu\/snacks\/aluminum-air-battery Size: 30mm x 30mm x 23mm Include:…<\/p>\n","protected":false},"author":1,"featured_media":198,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":""},"categories":[6,14],"tags":[],"jetpack_featured_media_url":"http:\/\/lluo.ca\/wp-content\/uploads\/2018\/11\/20181105_193659-e1541465803214.jpg","jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p7kiDJ-36","_links":{"self":[{"href":"http:\/\/lluo.ca\/index.php?rest_route=\/wp\/v2\/posts\/192"}],"collection":[{"href":"http:\/\/lluo.ca\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/lluo.ca\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/lluo.ca\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/lluo.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=192"}],"version-history":[{"count":12,"href":"http:\/\/lluo.ca\/index.php?rest_route=\/wp\/v2\/posts\/192\/revisions"}],"predecessor-version":[{"id":216,"href":"http:\/\/lluo.ca\/index.php?rest_route=\/wp\/v2\/posts\/192\/revisions\/216"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/lluo.ca\/index.php?rest_route=\/wp\/v2\/media\/198"}],"wp:attachment":[{"href":"http:\/\/lluo.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/lluo.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=192"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/lluo.ca\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"http:\/\/lluo.ca\/wp-content\/uploads\/2018\/11\/battery-288x300.jpg\")
<\/a>
\nSize: 30mm x 30mm x 23mm
\nInclude: 3 Cell Stack to create 1.5v voltage. (2.2v without load)
\nCurrent: 3mA @ 1.25v (tested after 24+ hours of lighting).
\nCurrent Range:\u00a01 to 3 mA current @ 0.7 to 1.25v. (voltage dropped to 0.7v last night and boost up to 1.25v, which is strange.)
\n* above voltage are source voltage.<\/p>\n![\"\"](\"http:\/\/lluo.ca\/wp-content\/uploads\/2018\/11\/20181105_193526-e1541465928254-169x300.jpg\")
<\/a> ![\"\"](\"http:\/\/lluo.ca\/wp-content\/uploads\/2018\/11\/20181105_193515-e1541465912846-169x300.jpg\")
<\/a><\/h5>\nStep 2: Make a joule thief<\/h3>\n
YX8018:<\/h4>\n
\nJapanese Edition<\/a>
\nChinese Edition<\/a><\/p>\n
\nhttps:\/\/github.com\/mcauser\/YX8018-solar-led-driver<\/a>
\nhttps:\/\/wiki.analog.com\/university\/courses\/alm1k\/alm-lab-15<\/a><\/p>\n
\n![\"\"](\"http:\/\/lluo.ca\/wp-content\/uploads\/2018\/11\/YX8018-294x300.jpg\")
<\/a><\/p>\nTest:<\/h5>\n
\nwith LED:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Current: 3.5mA\u00a0 \u00a0Duty Cycle: 44%\u00a0 Freq: 200khz
\nRemove LED:\u00a0 Current: 3.0mA\u00a0 \u00a0Duty Cycle: 30%\u00a0 Freq: 400khz<\/p>\nQX5252:<\/h4>\n
\nEnglish version<\/a><\/p>\nPrototype:<\/h5>\n
![\"\"](\"http:\/\/lluo.ca\/wp-content\/uploads\/2018\/11\/20181105_185951-300x169.jpg\")
<\/a>![\"\"](\"http:\/\/lluo.ca\/wp-content\/uploads\/2018\/11\/20181105_190013-300x169.jpg\")
<\/a><\/div>\nStep 3: ???<\/h3>\n
\nhttps:\/\/www.davidpilling.com\/wiki\/index.php\/SolarSensor
\nhttps:\/\/arduinodiy.wordpress.com\/2016\/05\/15\/solar-powering-an-attiny-or-arduino-with-a-capacitor-or-just-use-aa-part-2\/<\/p>","protected":false},"excerpt":{"rendered":"