the Draining of Batter let me explain 3 causes
1. Virus....if your tab is affected by virus it will drain battery to the fullest because it will be running stopless until battery is drained. at this point you might need to do a full flash
2. Heating up...if your tablet is heating up, this will also strain battery and reduce it life this might need a technician to check it
3. Dead Battery....if your battery is dead like it will just switch off without any notice and even if its 90% or whatever % at this point you might need replace battery
1. Virus....if your tab is affected by virus it will drain battery to the fullest because it will be running stopless until battery is drained. at this point you might need to do a full flash
2. Heating up...if your tablet is heating up, this will also strain battery and reduce it life this might need a technician to check it
3. Dead Battery....if your battery is dead like it will just switch off without any notice and even if its 90% or whatever % at this point you might need replace battery