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Old 06-23-2006, 10:03 PM   #1 (permalink)
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Default 8700r battery life question....

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i know there's threads and i've searched but i'm just curious.
i just got a new bb8700r on monday. I let it die 3 times (first time 5%, second 5% and third 10%). Now, i hardly am using it, maybe 5 minutes for the internet, MAYBE 30 minutes for a convo and like 15 texts. It was fully charged as of 10:30 AM this morning. It charged for over 11 hours. Now it's @ 25%? Is that normal?? it's 12.5 hours later....
Keep in mind, the leather case I have is too big so it doesn't 'shut off' necessarily with that battery charging thing, that case is en route from blackberry.com, but i constantly make sure it's off whenever i put it back into the case to not waste the backlight.
thanks!
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Old 06-23-2006, 10:23 PM   #2 (permalink)
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The backlight will suck the battery dry! If your case is keeping your screen lit constantly that will definitely happen! I use BBLight to keep me screen permalit and i have to charge my battery pretty frequently, which is ok with me. If the screen is powering down and youre still experiencing battery life shortage u need to replace the battery, it should be covered by warranty.
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Old 06-23-2006, 10:39 PM   #3 (permalink)
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Quote:
Originally Posted by jdjleo
The backlight will suck the battery dry! If your case is keeping your screen lit constantly that will definitely happen! I use BBLight to keep me screen permalit and i have to charge my battery pretty frequently, which is ok with me. If the screen is powering down and youre still experiencing battery life shortage u need to replace the battery, it should be covered by warranty.
----

I don't know about Rogers but Cingular will not replace Batteries on warranty. Maybe if it's under the 30 day limit, but not after 30 days. I know, I tried, neither store nor online sales, had a replacement battery for about 60 days, and online warranty support would not send a replacement battery at all. Thought I had a bad one, but finally decided it's just because I surf so much.

Hope this helps
Rcbjr.
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Old 06-24-2006, 12:15 AM   #4 (permalink)
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It seems unlikely that you would have damaged the battery by running it flat 3 times, but it is theoretically possible. Li-Ion batteries do not need to be "prepared" or "primed" by running them flat - this is a leftover belief from older battery technologies. Running a Li-Ion battery flat actually weakens it. Frequent top ups are good for them, and full discharges are bad for them - there are circuits in the battery to prevent a full discharge from ever occuring. From the Battery University reference page:

Much attention is focused to avoid over-charging and over-discharging.

Extreme low voltage must also be prevented. The safety circuit is designed to cut off the current path if the battery is inadvertently discharged below 2.50V/cell. At this voltage, most circuits render the battery unserviceable and a recharge on a regular charger is not possible.

Preparing new lithium-ion for use

Unlike nickel and lead-based batteries, a new lithium-ion pack does not need cycling through charging and discharging. Priming will make little difference because the maximum capacity of lithium-ion is available right from the beginning. Neither does a full discharge improve the capacity of a faded pack.

Whoops, I'm not allowed to post the URL to the page, so the URL is...

w w w (dot) batteryuniversity (dot) com (slash) partone-12.htm
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Old 06-24-2006, 09:27 AM   #5 (permalink)
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The case puts it in lit, but i turn it off immediately by pressing the 'power' button, which also is the backlight button....
i dunno, it just seems odd that it's a brand new unit and the battery like doesn't even last a full day?
thanks for the tips, i'll check out the battery pages!
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Old 06-27-2006, 09:54 PM   #6 (permalink)
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I have an 8700g and since I let the battery run to the point where the BB shut itself off, I have not been able to maintain battery life more than 15 hours (and with VERY little use. Maybe checked email 4 times, made one 10 minute call). I always keep the bb in the case, so the backlight is not the issue. My bb is only three months old so I'm currently looking into RIM's 1 year warantee on batteris:
(sorry about the formatting, cannot post URL)
h t t p : / / w w w.blackberry.com/legal/warranty/battery.shtml
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