How do I set my Trek to work with lithium batteries?

The ability to configure battery chemistry is available only if the Trek is in use with the BatteryPlus35-HA or BatteryPlus35-II-HA, which are capable of charging both lead acid and LiFePO4 type batteries.

By default, the BatteryPlus35-HA and BatteryPlus35-II-HA are configured to charge lead acid batteries. This can be changed with the Trek monitor.

To configure the BatteryPlus35-HA or BatteryPlus35-II-HA to charge LiFePO4 batteries with the Trek monitor:

1. Enter Set-Up mode by holding the HOME button down until Set-Up is seen on the
   Battery display.
2. Select the scroll arrows by pressing either the Backlight button or Water Pump button to navigate to the ADVANC menu function.
3. Select EDIT by pressing the Battery button.
4. Select the scroll arrows by pressing either the Backlight button or Water Pump button to navigate to the BATCHM menu function.
5. Select EDIT by pressing the Battery button.
6. Press either the Backlight button or the Water Pump button to cycle to the LIFEP4 battery chemistry.