Response to Hello Glen - The DIG36 has a digital display and the ST36 features "soft touch" buttons with LED lights. The DIG36 can provide power to a 2.5HP pump at 220v if you purchase an optional Relay Kit. If you are installing a variable speed pump, the AutoPilot will only provide power. The controls would be operated at the variable speed pump. You can view the pricing of the replacement cells here.

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