BatteryCare
Description
Laptop batteries degrade with use — every time the battery is charged it becomes less capable than its original design specification. The rate of degradation is dependent in part on patterns of use and habits of charging, and Windows’ in-box battery indicator displays charge percentage, but offers no indication of how the health of the battery has changed over time, or when cycling conditions indicate that the user should discharge and recharge the battery to calibrate the battery meter. BatteryCare monitors those metrics and delivers information that Windows conceals: design capacity versus original capacity, the number of charge cycles that the battery has logged, and real-time discharge rate data during use.
An independent developer released BatteryCare as a free utility aimed at laptop users who wish to have visibility into battery health and want to extend battery life by following discharge cycle recommendations. The software is present in the system tray, using very little resources, and provides detailed information about the battery when requested.
Battery Health Monitoring
BatteryCare reads battery information from the Windows power management interface and shows metrics that Windows doesn’t show in its standard battery indicator. Current design capacity indicates the maximum charge that the battery currently holds — which is often less than the original design capacity on older batteries. Original design capacity indicates the rated capacity of the manufacturer. The difference between the two, expressed as a wear level percentage, measures the amount of degradation the battery has undergone. Full charge capacity is a measure of how much the battery takes in during a full charge cycle.
Charge Cycle Counter
The charge cycle count measures the number of full discharge and recharge cycles that the battery has undergone since its manufacture. Lithium-ion batteries have a limited cycle life — most manufacturers rate their batteries for 300 to 500 cycles before significant capacity loss starts. Tracking the cycle count provides users with an objective measurement of where their battery is in its expected life, which supplements the wear level reading with a usage history measurement.
Discharge Cycle Recommendations
BatteryCare monitors the current discharge cycle and notifies the user when a complete discharge has been completed — when the battery has discharged from full to a low level without being plugged in during that range. The notification system monitors cycles and gives an alert when doing a calibration cycle (complete discharge and complete recharge without interruption) would be beneficial to the battery meter accuracy. For older nickel based battery chemistry the recommendation was more significant but BatteryCare applies the same tracking to modern lithium-ion batteries for those who follow calibration practices.
Real-Time Discharge Rate
A real-time discharge rate reading provides a current power draw reading in milliwatts, which helps users understand what activities drain the battery the quickest. The reading changes all the time and represents changes in load as soon as the user opens a demanding application or reduces the brightness of the screen.
System Tray Integration
BatteryCare is placed in the Windows system tray and shows the current charge percentage with a contextual icon. The tooltip on the tray icon provides current charge, estimated remaining time, discharge rate, and temperature. Right clicking on the icon opens the full information panel. The presence of the tray allows battery information to be available without taking up taskbar space.
Power Plan Switching
BatteryCare to switch between Windows power plans from the menu on the tray. Switching to Balanced from Power Saver when away from a power outlet helps to increase battery life by lowering CPU frequency limits, screen brightness and background activity. The power plan switcher is faster than going through Windows power options.
Temperature Monitoring
BatteryCare reads the battery temperature from the hardware sensor, and displays it along with the rest of the battery information. Elevated battery temperatures during charging or under load will accelerate the rate of capacity degradation over time, and the temperature reading provides a reference for users monitoring whether thermal performance has changed.
Notifications and Alerts
Configurable alerts are triggered when the battery is at certain charge levels — a low battery alert when the charge falls below a user-defined percentage, and a full charge alert when the charging process is completed. Alerts appear in the form of Windows system notifications.
