Patent ID: 8546006

Claim:
A method of delivering a fluid to a fluid electrolyte rechargeable battery string comprising at least one battery cell, the method comprising: providing a tank adapted to hold the fluid; providing at least one conduit adapted to transfer the fluid through the conduit to the at least one battery cell; providing a pump adapted to pump the fluid from the tank when the pump is turned on; providing a controller adapted to monitor the performance of the battery string by: a. periodically taking battery voltage readings during a measurement period after an interval of time; b. determining if at least a first predetermined percentage of the battery voltage readings are greater than a first threshold voltage; c. initiating a first delay if the first predetermined percentage of the battery voltage readings are greater than the first threshold voltage; d. repeating a through c if the first predetermined percentage of the battery voltage readings are not greater than the threshold voltage; e. determining if a second predetermined percentage of the battery voltage readings are greater than a second threshold voltage if steps a through c have been repeated a predetermined number of times without initiating the first delay, wherein the second threshold voltage is less than the first threshold voltage; and f. initiating a second delay if the second predetermined percentage of the battery voltage readings are greater than the second threshold voltage; and turning on the pump after the first delay or the second delay.