Ipad battery..weird.

[BlackOropher26]

Back then,i posted a thread about my battery going back to 99%..and it was resolved by charging it for another hour.
Now i was worried again coz goes down to 99 so easily.I only used my ipad with a 100% charge within 19 minutes.Usually,it goes down after 30 to 40 minutes.And this happen sometimes..not many times,but it happened already twice.

 

[scifan57]

How fast the charge level drops depends on how the iPad is being used. More intensive CPU and graphics use consume more power, as does having the brightness set at a high level.

 

[BlackOropher26]

How fast the charge level drops depends on how the iPad is being used. More intensive CPU and graphics use consume more power, as does having the brightness set at a high level.

Well.. I use the same apps even before(facebook,temple run 1,twitter and draw my thing)
Obviously,the most graphic one is Temple run.Even though,i still manage to use my ipad within 30 minutes even the wifi is on..before
But now it doesn't.what happen?