My battery Bar is drop when full charge

I m using BB 9800 when I charge my phone full charge it does drop the bar when I start using it and it can last up to 8 hour and d battery will remains like that once the battery is low it drop to red bar. Can anybody help with how to fix this problem please

Hi and Welcome to the Community!
Please try this sequence...note that, throughout the entire 4h15m process, your BB must remain directly connected to a known-good wall charger (not PC USB, not a cradle):
With the battery inside, connect your BB to the wall charger
Leave it alone for 2 hours, no matter what the LED or the display does
Remove the battery
Wait 15 minutes
Insert the battery
Wait another 2 hours, no matter what the LED or the display does
This has been known to "kick start" some BBs.
It is also possible that your battery or BB has experienced a problem...to test, this sequence is needed:
Obtain an known good and already fully charged additional battery...use it in your BB and see what happens
Obtain access to a known good and identical BB...use your battery in it and see what happens
The results of this will indicate if it's your BB or your battery that has the problem. Note carefully please that "new" and "know good" are not necessarily the same things. While rare, a "new" battery certainly could be defective. Rather, the simplest (and least costly, btw) method to conduct this test is to find someone with an identical BB who has no issues...trade batteries and see what happens.
Good luck and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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I need help! I have been using my new Sony Xperia Z3C for 4 days now. It came with Lollipop update.
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Hi Phy,
yes I allready did the SIM card and SD card test and removed both of them but it's the same issue. Sometimes it works for hours without a problem and then it starts to reboot every few minutes. It really has no rules.
I guess considering all the similar topics I read and your suggestions it is definitly a hardware issue.
Thankfully I will get a replacement on Monday.
I will update what kind of issue it was if I get that information.
Cheers!
Branko

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My battery Bar is drop when full charge

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