Sometimes battery time indicator drops very quickly or displays inaccurate remaining time. You may need to consider to calibrate the battery. Apple recommend to calibrate the battery every two months.
The battery has an internal microprocessor that provides an estimate of the amount of energy in the battery as it charges and discharges. The battery needs to be recalibrated from time to time to keep the onscreen battery time and percent display accurate…
Here is the link to instruction.
Speaking or battery health, try to use iStat Pro Widget, a system monitoring tool. It checkes the health of battery. In addition, it provides highly detailed information on CPUs (up to eight cores), memory, hard drives, IP and external IP, bandwidth, wireless keyboard and mouse battery, uptime, temperatures, and fans. You’ll know exactly what’s going on inside your Mac.
