{"id":1194,"date":"2008-09-08T18:22:45","date_gmt":"2008-09-08T18:22:45","guid":{"rendered":"http:\/\/www.markwilson.co.uk\/blog\/2008\/09\/iphone-always-out-of-juice-reset-the-battery-indicator-calibration-with-a-full-dischangecharge.htm"},"modified":"2012-09-18T09:11:02","modified_gmt":"2012-09-18T08:11:02","slug":"iphone-always-out-of-juice-reset-the-battery-indicator-calibration-with-a-full-dischargecharge","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2008\/09\/iphone-always-out-of-juice-reset-the-battery-indicator-calibration-with-a-full-dischargecharge.htm","title":{"rendered":"iPhone always out of juice? Reset the battery indicator calibration with a full discharge\/charge"},"content":{"rendered":"

There’s a lot of FUD around about iPhone battery life<\/a> (and a lot of science involved in understanding the optimum recharge regime for Lithium-Ion batteries<\/a>) but, even so, I was finding that my brand new iPhone 3G was getting down to around 30% after a just few hours of light use. It didn’t seem unreasonable if I was making calls but just sitting in my pocket?<\/p>\n

In theory, the best advice on increasing battery lifespan comes from Apple<\/a> and they do say that:<\/p>\n

“For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down).”<\/p><\/blockquote>\n

Then, one of my friends told me something that Apple doesn’t mention and it seems to have made a big difference to my indicated battery life.\"iPhone I don’t turn off Wi-Fi, 3G, location services, etc. unless I’m getting low on charge (because I actually want to use those features that I bought the phone for…) and I don’t have push e-mail since moving to GMail<\/a> but, following my friend’s advice, I let the phone run completely out of juice and it took a long time to completely die after the warning messages for 20% and 10% battery power remaining. Then, after a full charge, my battery indicator seems to have calibrated itself to a much more realistic value (for reference, I’m on firmware v2.0.2).<\/p>\n

Of course, usage patterns will vary but my iPhone is currently showing about 60% battery with 55 Minutes of use and 21 hours and 58 minutes on standby since the last full charge.<\/p>\n

The iPhone 3G battery guide and charging tips post on Macrumors<\/a> has a stack of information about iPhone battery life (including cited sources).<\/p>\n","protected":false},"excerpt":{"rendered":"

There’s a lot of FUD around about iPhone battery life (and a lot of science involved in understanding the optimum recharge regime for Lithium-Ion batteries) but, even so, I was finding that my brand new iPhone 3G was getting down to around 30% after a just few hours of light use. It didn’t seem unreasonable … Continue reading iPhone always out of juice? Reset the battery indicator calibration with a full discharge\/charge<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[218],"tags":[148],"class_list":["post-1194","post","type-post","status-publish","format-standard","hentry","category-technology","tag-iphone"],"yoast_head":"\niPhone always out of juice? 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The garage door control system\u00a0is a\u2026","rel":"","context":"In "Technology"","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"Somfy Rollixo RTS instruction manual has incorrect diagnostics for low battery warning on safety-edge transmitter","src":"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/somfy-rollixo-rts-safety-edge-low-battery.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":1327,"url":"https:\/\/www.markwilson.co.uk\/blog\/2009\/01\/crack-in-iphone-case-replaced-under-warranty-by-apple.htm","url_meta":{"origin":1194,"position":3},"title":"Crack in iPhone case: Replaced under warranty by Apple","author":"Mark Wilson","date":"Wednesday 7 January 2009","format":false,"excerpt":"Alex says that I write too much about Microsoft and not enough good news about Apple... and there's a reason for that (two reasons actually). Anyway, here's a good news story about Apple. My iPhone 3G has developed a crack in the case. In fact, there's not just one crack\u2026","rel":"","context":"In \"Apple iPhone\"","block_context":{"text":"Apple iPhone","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/iphone"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1175,"url":"https:\/\/www.markwilson.co.uk\/blog\/2008\/08\/iphone-20-screenshots-and-why-gps-on-an-iphone-is-a-good-thing.htm","url_meta":{"origin":1194,"position":4},"title":"iPhone 2.0 screenshots (and why GPS on an iPhone is worthwhile)","author":"Mark Wilson","date":"Wednesday 27 August 2008","format":false,"excerpt":"For a while now, there have been various third party screenshot utilities around for jailbroken iPhones but there is also a built in function in the iPhone 2.0 software (I haven't tried on earlier versions). Just press the home and sleep keys together, the screen will briefly flash which, and\u2026","rel":"","context":"In \"Apple iPhone\"","block_context":{"text":"Apple iPhone","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/iphone"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":963,"url":"https:\/\/www.markwilson.co.uk\/blog\/2007\/12\/not-blown-away-as-altec-lansing-goes-into-orbit.htm","url_meta":{"origin":1194,"position":5},"title":"Not blown away as Altec Lansing goes into orbit","author":"Mark Wilson","date":"Monday 17 December 2007","format":false,"excerpt":"Just over a year ago, I bought an iPod speaker system from Altec Lansing. Easily as good as the Apple equivalent (and at less than half the price), I've been really pleased with them, so when Altec Lansing's public relations team got in touch and asked if I'd be interested\u2026","rel":"","context":"In \"Apple iPhone\"","block_context":{"text":"Apple iPhone","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/iphone"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/1194","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=1194"}],"version-history":[{"count":1,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/1194\/revisions"}],"predecessor-version":[{"id":4344,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/1194\/revisions\/4344"}],"wp:attachment":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=1194"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=1194"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=1194"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}