iOptron AZ Mount Pro - Check Hand Controller Battery

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 SDRL: mount is tracking at a sidereal speed;
 Solar: mount is tracking at a solar speed;
 Lunar: mount is tracking at a lunar speed;
 King: mount is tracking at a King speed;
 CSTM: mount us tracking at a customer defined speed.
12. Slew speed: It has 9 speeds: 1X, 2X, 8X, 16X, 64X, 128X, 256X, 512X, MAX (2400X,~10º/sec).
13. Operation Mode: AA is for alt-azimuth mode.
2.4. Check Hand Controller Battery
The hand controller has a real time clock (RTC) which should display the correct time every time
the mount is turned on. If the time is incorrect, please check the battery inside the hand
controller and replace it if needed. The battery is a 3V, CR1220 button battery.