William,

Run the lift until it reaches 80% discharged, take a specific gravity reading. Charge the battery until fully charged and take another reading. Battery AMP hour 600 set to 17, 700 to 18, 800 to 19 and so on. This is for new batteries. With the readings you get you can raise or lower as needed to extend run time. You can also turn on the extended shift function which lets the lift operate at a economy mode without wearing down the battery. Be careful not to make big changes as it can drain the battery. What are the numbers now? There are two listings, one for early and late models. Thanks.