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pavithra_uk Posts: 100

I recently brought SE C702 used phone. not much usage. but when I use it for 10-30 minutes some phone functions
phone heating (keypad area and battery cover)

I removed the battery cover and check the battery's heat it also hot. It seems to batter and phone heating. Battery
life is 1 day when heavy use.

Please help me to solve this problem.
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Posted: 2009-10-15 15:19:59
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StevenC Posts: > 500

1. Turn off 3g, it uses lots of battery power. My phone becomes warm also when I'm using 3g.
2. Decrease display brightness.
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Posted: 2009-10-15 16:27:16
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pavithra_uk Posts: 100

Thanks for the answer. I already did these tricks but there is no effect.
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Posted: 2009-10-15 17:01:00
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mrjulius Posts: > 500

same here in c902. using at the same time. music. internet. downloading. surfing. txting. hehehe. its suicide hehehe. but still kicking and working fine
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Posted: 2009-10-15 18:18:41
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pavithra_uk Posts: 100

On 2009-10-15 18:18:41, mrjulius wrote:
same here in c902. using at the same time. music. internet. downloading. surfing. txting. hehehe. its suicide hehehe. but still kicking and working fine

Thanks for reply.

Friend, how is the battery life ?.

I checked another phone, its working cooler. sorry, Im forget to check it's firmware version
mine : R3EA037 (CHINA)
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Posted: 2009-10-15 18:25:27
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mrjulius Posts: > 500

in first m0nth. my battery low bat in 3 days in 3 m0nth. lowbat in 2 days in 9m0nth. lowbat in 1 day. they say. the battery must put in freezer to recycle the chemical inside but i d0nt believe
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Posted: 2009-10-15 18:31:27
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pavithra_uk Posts: 100

On 2009-10-15 18:31:27, mrjulius wrote:
in first m0nth. my battery low bat in 3 days in 3 m0nth. lowbat in 2 days in 9m0nth. lowbat in 1 day. they say. the battery must put in freezer to recycle the chemical inside but i d0nt believe

I will try this trick and send you are there any improvements. sometimes heat may damage the battery chemical structure.
and thats why they said, put it on a freezer. How long time it keep freezed ? charged or discharged ?

My battery also getting hot when it charging from empty. I think thats nomal. but Im wondering sonyericsson guys
doesn't know such a heat problem.
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Posted: 2009-10-16 04:31:25
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StevenC Posts: > 500

Make sure you have a genuine battery. Usually Li batteries don't get hot, or at least just very little.
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Posted: 2009-10-16 08:17:54
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pavithra_uk Posts: 100

On 2009-10-16 08:17:54, StevenC wrote:
Make sure you have a genuine battery. Usually Li batteries don't get hot, or at least just very little.

Yes, its a genuine battery that comes with phone. Now Im going to check current drawing from battery when it use.

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Posted: 2009-10-16 09:40:03
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pavithra_uk Posts: 100

Here current draw from battery (C702, battery 75% charged)
Screen brightness = 80%

Idle (standby GSM) = 3-5 mA pulsating
Display on, standby = 120 mA
GPS Search = 265 mA
GSM Call (display on) = 300 mA
GSM Call (after 30 sec) = 230 mA

Screen Brightness adjustment:

50% = 60 mA
80% = 120 mA
100% = 150 mA

Normal phone functions @ 80% sc.brightness = 150-200 mA

Charging current @ 56% battery = 700 mA

Current sensing ressitor = 20 mOHM

I used another battery BST-37 to power phone via current sense ressitor. phone still emits heat and battery remain
cool even heavy load.
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Posted: 2009-10-16 15:22:20
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