My Samsung Galaxy 7in. Keeps Losing Its Charge.

Greetings - This is very common with some Samsungs (It sadly appears to be one of the flaws). On the link below is a number of people on the same boat (bizzared by their Samsung's battery consumssion) -

One from the same thread is quoted advising thus -

I think I may've found a resolution to this problem. At least it worked for me, on both phones that I have. I started with "Android System" using 40% and "Android OS" over 30% on each of my phones, and now they're all at 4%.
The problem definitely seems Wi-Fi related, but turning Wi-Fi alone is just a temporary fix. Here's what I did:
1. Turn the Wi-Fi off, then wait few minutes and turn it back on.
2. Let you battery drain completely - play some games if you want to speed it up, or just wait, but DON'T CHARGE when prompted. You have to let your battery drain completely - let the phone die on you from the lack of power.
3. Charge the phone fully. Don't disconnect the charger until you see the icon in your status bar that shows the battery has been charged completely. Youcan use the phone while charging, if you have to, but it'll charge faster if you don't.
4. If you now check the battery use, you may still see the same results as before, but just use your phone a bit and come back and check later, and you should be good.
If this doesn't work for you, do this again but this time after resetting Wi-Fi (step 1) turn the phone off and remove the battery for a minute. Then continue to step 2-4.

http://androidforums.com/samsung-galaxy-s2-t-mobile/481966-my-samsung-galaxy-s2-batteries-suddenly-drain-within-hours.html

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Hope that is helpful.
Kervz at www.satechhelp.co.za

Try to turn on airplane mode and reduce screen brightness. It will last much longer.

Good luck.