Battery management in a device with multiple batteries

A method implemented by a computing device, the method comprising:

• acquiring data indicative of cycle counts for multiple batteries of a battery system for the computing device;
• indentifying differences in the cycle counts between different batteries of the multiple batteries;
• establishing different tiers of the differences in the cycle counts, the different tiers including a first tier corresponding to the difference in the cycle counts being greater than a first threshold value, a second tier corresponding to the difference in the cycle counts eing greater than a second thershold value and less than the first threshold value, and a third tier corresponding to the difference in the cycle counts being less than the second threshold value;
• adjusting a policy used to control charging and discharging of the multiple batteries to account for the identified differences and balance the differences in the cycle counts to within a designated target range, the adjusting comprising correlating a control mode to one of the different tiers of the differences in the cycle counts, and selcting the conrol mode to control the charging and discharging of the multiple batteries;
• and
• discharging at least one of the batteries according to the selected control mode.

A method performed by a computing device, the method comprising:

• determining a current charge cycle count difference between a first battery and a second battery, the current charge cycle count difference reflecting a difference between a number of charge cycles of the first battery and a number of charge cycles of the second battery;
• based at least on the current charge cycle count difference between the first battery and the second battery, determining a particular threshold charge level of the second battery at which to begin discharging the first battery;
• comparing a current charge level of the second battery to the particular threshold charge level;
• when the current charge level of the second battery exceeds the particular threshold charge level, servicing a load by discharging the second battery without discharging the first battery;
• and
• after the current charge level of the second battery falls below the particular threshold charge level, servicing the load by discharging both the first battery and the second battery.