Is your system's BIOS and battery firmware updated to the latest level? If not, you may not be getting the maximum capacity and run time from your battery. Lenovo's engineering team released updated BIOS and battery firmware in July that is applicable to customers who have ThinkPad models X100e, L410/L510, L412/L512, SL410/SL510, T410/T410i, T510,T510i, W510 or ThinkPad Edge, 13, 14, or 15 inch units. "This battery firmware update utility fixes an issue where some batteries indicate an incorrect full charge capacity value. Because of this error, the amount of energy available for use is artificially low, decreasing the amount of time the system can be used on battery. The fix is entirely contained in the battery firmware update; there is no need to replace any hardware for this problem." Customers who use Lenovo ThinkVantage Toolboxwould have received a notification and opportunity to apply this update, and Lenovo's ThinkVantage System Update tool would also identify and apply these updates. If you aren't using either of these tools, and have one of the systems above, please follow this link to our support site. You can learn more there, and download and install the updates specific to your system. Probably also worth mentioning, is an earlier tip applicable to X200t and X201t tabletusers who have 8 cell extended batteries. This technical tip and related BIOS updates ensure these batteries properly charge to their full capacities, and resolves a particular symptom where the battery would stop charging at less than 50%.