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< Esato Forum Index > Sony Ericsson / Sony > Symbian phones > Ill-effects of ignoring initial battery charge recommendation Bookmark topic

Hello folks:

Immediately after purchasing my P900, I was using it aboard a plane instead of charging it for 8 hours! The battery level went down to 50% before I got home and charged it for 8 hours solid.

I now notice that the battery is consumed real fast between 100% and 50%, and much more gradually thereafter from 50% to 0%.

Is there anyway to rectify this situation and regain the full potential of the battery?

And should that have been 16 soldi hours of charging before first use, 8 hours as the salesman recommended, or just 4 hours as specified in the manual?


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Posted: 2004-10-18 19:36:07
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Read this
http://www.batteryuniversity.com/

And search the forum..
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Posted: 2004-10-18 19:52:17
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I would be more inclined to trust what it says in the manual than some mobile phone sales boy who probably doesn't know how to wire a plug let alone the in's and out's of battery discharge and recharging characteristics. And btw, don't trust how full the phone says the battery is, it just guesses based on the voltage across it and is a guide not an exact measure. This message was posted from a T610
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Posted: 2004-10-18 19:59:24
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Nothing much will happen. After 2 weeks of usage, the batt will come back and work the way it is used to. Trust me. This message was posted from a K500
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Posted: 2004-10-18 22:41:56
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Well my battery has been pretty average, performance-wise, for the last 9 months or so. But from thursday to Sunday, the charge drained real fast. I thought the battery had reached the end of it useful life, but today it suddenly went back to performing as per usual. So i suppose the battery has its ups and downs. Before you ask, my usage was normal and constant over that period.
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Posted: 2004-10-18 22:54:53
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Looks like that the SE P900 models has similar setbacks with the K700/i ones when it comes to battery issue ?
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Posted: 2004-10-19 02:22:03
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I'd trust the manual more. Ericsson/SE batteries are some of the best in the industry. Their LiPols aren't as quirky as the LiIons of Nokia.

The initial charge for Lithium based batteries doesn't have the same effect as initial charges on NiMH.

What does kill a Lithium battery is the old-school "drain it til your phone dies" process. This technique maximized the life on older NiCD and NiMH batteries... but this shortens the number of charging cycles a Lithium (both LiIon and LiPol) battery can go through.

Also note that batteries are very sensitive to temperature conditions... during use, and during charging. Try to keep them away from extreme heat or cold.
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Posted: 2004-10-19 02:48:32
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Dont forget that inside an airplane is basically a faraday cage which equals zero electrical potential which equals no voltage. Also, at 30000 feet the pressure is lower so the current will come out of your battery faster.
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Posted: 2004-10-19 02:55:02
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@ljplacson... you've written that fully discharging and charging a lithium batt is actually bad... but manufacturers recommend that a few initial cycles of discharge/charge are required for the batt. to reach max efficiency... This message was posted from a P800
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Posted: 2004-10-19 06:48:26
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yes, charge/discharge cycles are recommended initially... but remember how in the past, people would actually COMPLETELY drain their NiMH batts by turning on their phones even after the phone shuts off? Just to get rid of the last few ounces of power? Or they even had those small discharge lights that people would plug to their batteries, to completely drain them? These methods aren't recommended by Lithium battery manufacturers.

A complete discharge damages the lithium cells.

When SE phones give you a low-batt warning and flash RED, you don't have to wait for the phone to completely die. Waiting for the phone to shut down is still ok, since SE's phones and batteries have smart chips in them... but not necessary. A red warning light is enough, then you can charge your phone. For the first few times... wait til the light flashes red (and the batt meter looks empty) then do a 4 hour charge... then repeat this for about 5 charge cyles... then you've reached the battery's max efficiency.
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Posted: 2004-10-19 07:14:02
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