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Any correlation between 4S battery and build week?

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Original poster
Feb 18, 2009
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EDIT: As it turns out the quoted interpretation of serial numbers (below) is likely incorrect. Instead, to determine your build week please try this tool (thanks HiRez) to determine build week. The tool was made for older iphones but it may still be valid for IP4S?

EDIT: If you are having battery issues please try Airplane Mode and putting your phone to sleep and observing the battery drainage. If it's significantly less drainage this is all very very likely just an iOS problem!

f00f said:
(wrong method! Ignore!)
For those experiencing perceived battery issues with the 4S -- and those who are not! -- what week was your 4S built?

Look at the serial number (Settings / General / About). What's the first three characters?

Mine's C38 (black 64GB). Not sure what the C means, but the 38 means 38th week.

PS -- Oh and please note if you believe you are having battery issues. I know I am. This thing has dropped 6% in an hour doing absolutely nothing.
Click to expand...
 
Last edited:
f00f said:
For those experiencing perceived battery issues with the 4S -- and those who are not! -- what week was your 4S built?

Look at the serial number (Settings / General / About). What's the first three characters?

Mine's C38 (black 64GB). Not sure what the C means, but the 38 means 38th week.

PS -- Oh and please note if you believe you are having battery issues. I know I am. This thing has dropped 6% in an hour doing absolutely nothing.
Click to expand...

Honestly, I'm a little disappointed with my battery as well... it seems to be draining VERY quickly. Mine is C39.
 
Mine is c38 as well and my battery is not very good. My iphone 4 battery lasts much longer.
 
My wife's 64GB white IP4S is C39 as well.

Hers has dropped 24% in just under 5 hours of standby, 28 minutes usage.

edit: OK we just need to hear from folks that have good batteries :)
 
Interesting theory, don't know if it pans out though. I have 2 new iPhone 4Ss, each of them is "C39" and both are getting very good battery life so far (whether idle or in use), and both have pretty much everything turned on (location, Bluetooth, push email, etc.). Seeing 5.5 to over 9 hours of active usage time (3D games run it down faster), and when idle they only drop about 3% overnight (8 hours), but still everything turned on. Verizon phones, screen brightness at about 50%.

What might be even more relevant than the build week is the location where they were built, maybe a certain batch from a certain production line is bad. Don't know if there's a way to determine that.
 
Umm, my Serial # begins with DNP. What the heck does that mean?
 
HiRez said:
...
What might be even more relevant than the build week is the location where they were built, maybe a certain batch from a certain production line is bad. Don't know if there's a way to determine that.
Click to expand...

Very good point. Combination of build week and location could determine when and where there was a bad batch of batteries in the production lines -- if this is indeed the cause of the drainage.

I'm sure the serial depicts the location but no idea how to decipher it yet either.
 
First three characters? Well that's a bit of a fail for mine as the first 5 are letters, in fact there are only 3 digits in the whole serial number... Is that weird?

Also the first few days my battery was shocking but today I'm down to 51% after 18 hours. Not bad indeed :D
 
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3)

I don't think I'm having battery issues, but this morning, I unplugged my iPhone from my computer and the 100% with the plugged in symbol went immediately to 98% literally the second I unplugged it. Mine is a C38.
 
Perhaps the serials are carrier dependent? Not really sure; I don't think anyone has figured out how to decipher them entirely yet.

The few posts I've come across on the 'net suggested the second and third characters are numbers and combined represent the week. Perhaps only for AT&T activated phones? Just a hunch. My AT&T handset serial only has two numbers in it.


One sure-fire way to rule out the battery hardware is simply to put the phone in Airplane mode & put it to sleep. I've done just this and it hasn't budged whereas earlier it was dropped about 7% and hour.
 
f00f said:
Perhaps the serials are carrier dependent? Not really sure; I don't think anyone has figured out how to decipher them entirely yet.

The few posts I've come across on the 'net suggested the second and third characters are numbers and combined represent the week. Perhaps only for AT&T activated phones? Just a hunch. My AT&T handset serial only has two numbers in it.


One sure-fire way to rule out the battery hardware is simply to put the phone in Airplane mode & put it to sleep. I've done just this and it hasn't budged whereas earlier it was dropped about 7% and hour.
Click to expand...

I agree, I think this is a software issue. In airplane mode my battery does not budge.
 
DNP also on Sprint. No real discernable code in S/N that would reveal build week. Battery is AWFUL, particularly when it's sitting next to my work 3GS that also has iOS 5.
 
C37. Under Settings->General, Usage = 24 minutes, Standby = 1 hour 53 minutes, battery is 98%.
 
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3)

C39
Drains pretty fast in use but I expect it would
No standby issues. 2 % over night
 
are you sure this isnt anything to do with ios5? i remember on android tmobile g1 the battery was like a tire with 20 puncture holes in it, then after a update the battery was improved by 40% and i mean i went from 5 hours needing a charge to a whole day then needing a charge...
 
Mine is DNP on Verizon. There are no consecutive numbers. But my battery is at 74% and has been unplugged for 6 hours with moderate usage.
 
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