Battery life can determine just how long a tablet can be used away from source of power. Given battery lives are only estimates, as actually battery life depends on what the tablet is being used for. Watching streaming videos tends to drain the battery faster than reading ebooks. Services such as WiFi and Bluetooth drain the battery faster and, if the tablet is going to be away from a source of power and these are not going to be used, they should be turned off.
The Tagital T10K has a stated battery life of 5 hours. This is not that impressive, but not the worst around. When travelling with the tablet, such as a in-car charger will not go amiss.