My Blackberry Curve 9300 shuts down around 40% without any notification. I've replaced the battery and that didn't solve the issue, I've wiped & did a restore & that still didn't resolve the issue. So I replaced the phone and that didn't even resolve my issue. I also deleted every 3rd party app but that didn't seem to be the problem. So I contacted T-Mobile and they told me it's probably the software. I tried reloading the software yesturday with the application loader then restoring everything after but it still shut down. Am i supposed to delete some vendor file or something? Or should i just downgrade back to OS 5? Because this didn't seem to happen when i was using OS 5. Maybe I'm doing something wrong when i reload/update the software?

Check the sticky at the top of the 9300 section for the latest OS and our instructions. Follow them exactly and be patient as it can take an hour or longer.

The file to delete in the vendor.xml.

So far 2 blackberrys, replaced battery, wipe and restore. You did not indicate HOW you use the BB. Could it be your using Facebook or another social app? LI batterys will drop very quick at that level if they ever were allowed to be fully discharged. Was the batter OEM or a after market? I have some friends with 9300's with OS6 and 5 and none have this issue except one who uses twitter constantly.

I use both Facebook & Twitter but i don't use it constantly. Even if i didn't have those apps installed, it would shut down.

Does it shut off and stay off? If so, will it power on again? If so, what battery level do you read in options > status after you power it back on?
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Yes, it shuts off & stays off. It won't power on again unless i charge it. And when it does power back on, it starts from 0%.

Beats the heck out of me. The fact that you've swapped batteries and even swapped devices points to software or user, and you seem to have ruled out app(s) as the problem.

I don't see a problem with downgrading the OS, or upgrading if possible, at least as a test.

Are you perhaps leaving the BlackBerry in a closed up car, exposing it to heat? Or exposing it to very cold temperatures for periods of time?
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No, i am not exposing my Blackberry to heat or cold temperatures. I'm going to delete the vendor.xml file and reload the OS to my device with the application loader and see if my problem persists. I forgot to mention that i've updated my BB to an OS 6 BETA version without deleting that vendor.xml file so that's what probably messed it up but i'm not sure. If i still have a problem, i will downgrade my BB back to OS 5 to see if this solves the issue.

Not deleting the vendor.xml file is not the cause of your present problem. Installing a beta OS may be. Definitely install an official OS release and let's see what happens.
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Let us know what you find after downgrading.. This is an interesting problem. i would suggest if it happens with OS5 look to how your using FB or Twitter.

Okay, so i reloaded the OS 6 which was an official version from my carrier & that didn't help. Then i downgraded back to OS 5 & it shut off once again (I don't have facebook or twitter installed at this point). I don't know what's wrong?

did you find the solution? i have the same problem!

I noticed on one BB that location services was turned on and it caused the battery to drain within 6 hours. It may have to do with my location or the App I installed ( deleted)
called POYNT. Maybe the percentage indicator is not accurate and it is lower. One thing on an LI battery, They dont like to be discharged below 20-25 % or they can go bad quick.

Mine just started screwing up like this too. I've had it for less than 4 months and it has been great up 'til now. But 2 days ago the battery decided it would hold a charge for maybe 45 mins of no use. I got a new battery and it's a _bit_ better, but it keeps shutting off at random and I need to take the battery out to start it again. I just get a flashing red light and it won't turn on, even though the battery is 3/4 full (it still seems to be draining faster than before). This is incredibly frustrating because I'm about to go on vacation and only have a couple of days to resolve this.
I make sure to shut off programs and apps when I'm done with them, turned off location services as recommended, keep it out of heat and cold... The os is up to date. What the heck is wrong with this thing?

Replace the battery. If you let it drain below 20-25% it wont last long.

I have the exact same problem. I have had my blackberry for 20 months and on a 24 months contract.

I can have my blackberry curve 9300 3G on charge ALL NIGHT and still the next day when I unplug the charger the battery only lasts 2 or 3 hours at the most. I do not have many apps on my phone, nor do i use them constantly. I tried changing the battery to a brand newly purchased one and that was a barrel of laughs!! Only lasted 2 hours. It is getting to the point where I want an upgrade NOW and I still have 4 months to go to get it! I was on a call to the emergency services not that long ago and my stupid blackberry cut out. Luckily they were able to track my call so they got to the emergency. In situations like that....That is not on. It's a disgrace!! To any expert, find a solution now!

Two things:

1. This forum is not associated with RIM, the makers of BlackBerry. It is privately-owned, and we are all volunteers. Do not make demands of us.
2. Don't bump old threads.

I'm having the same problem. Started about 3 months ago. Thought it was due to roaming (which chews up battery life like crazy), but now it blacks out about once every 15 minutes of continuous use. Complete shut down, then takes forever to power up. When it does, the battery is completely exhausted. Doesn't appear to matter which app or task I am doing. Could be sitting at home talking, texting on the bus, sending an e-mail, or playing an off-line game. And no, the phone has never seen the extreme cold, or warm, or ever been wet. The idiot at the MTS counter (my provider) had no idea what to do other than say it must be something I am doing....RIGHT! Glad to find out that swapping out batteries does nothing to it. Also, I haven't downloaded any apps for over a year and refuse to upgrade the operating system or upgrade any of the programs like crunchSMS. It happens without any warning what so ever and doesn't matter if the phone fully charged or down one bar. Very Frustrated BlackBerry User....perhaps iPhone next! RIM, needs to jump on these issues. Phone is a Pearl 8220 (not 9300).

Thanks.

I'm right there with you. Not only did I try a new battery in my old phone, but I just got a brand new BB curve and the same thing continues to occur...this phone is the worst and I'm getting super frustrated as well. RIM needs to resolve this issue for its consumers. If anyone has the solution, please let me know