If you're like me, your laptop spends as much time on your desk as it does on the road
. If you are leaving the battery connected while on AC power in office, it's in the loss of charge cycles. Battery's temperature is higher on AC power resulting in accelerated aging. That's not good for battery's life. Thefore, just use the battery when you need it. When on traveling, try to rely only fitfully on your batteries. The optimal charge level is 40% for prolonged storage. For Lithium-Ion Toshiba laptop battery cells, full discharge/recharge cycles result in an increased loss of capacity, so, partial charge is better for keeping the battery life. If you run your laptop remotely all the time causing deep battery drains, you won't get as much life out of your batteries.