Patent ID: 9557386
Date: 2017-01-31
CPC Classifications: A63B,G01R,H02J

Claim:
1. A method comprising: detecting, by an athletic activity monitoring device, entry of the athletic activity monitoring device into a battery charging state; determining, by the athletic activity monitoring device, an initial charge value of a battery of the athletic activity monitoring device at or prior to entry into the battery charging state; activating a charging unit of the athletic activity monitoring device in response to detecting entry of the athletic activity monitoring device into the battery charging state and upon determining the initial charge value of the battery, wherein activating the charging unit changes a charge value of the battery; determining, by the athletic activity monitoring device, an elapsed amount of time since activation of the charging unit; determining, by the athletic activity monitoring device, a current amount of battery charge based on the elapsed amount of time and the initial charge value of the battery without a subsequent reading of a voltage from the battery using a look-up table associating a charge amount of the battery with an amount of time required to charge the battery from the charge amount of the battery to a fully charged state; deactivating the charging unit of the athletic activity monitoring device in response to detecting a change in state of the athletic activity monitoring device from the battery charging state; determining, by the athletic activity monitoring device, a final charge value of the battery upon deactivation of the charging unit; determining whether the final charge value corresponds to a fully charged state; upon determining the final charge value corresponds to the fully charged state, measuring an elapsed amount of time to charge the battery from the initial charge value to the fully charged state; and automatically updating the look-up table with the measured amount of time.