Generally up to 3 years - Battery life comes down to a few factors such as, amount of usage, weather (heat) and for solar, how often it has a full top up charge
With normal usage on the gate you could look at 4 days with no sun on the panel (also taking into account other accessories powered by the battery). On standby you will get up to 11 days with medium sleep mode activated or 15 days if deep sleep mode is activated.
The manufacturer recommends checking the oil level periodically by removing the oil level screw and refilling the gearbox with S.A.E.75W/90.
We do recommend keeping an eye out for insect or bug infestation on the main control board as well as checking the nylon racking every so often to make sure there are no worn teeth or that the racking has dropped over time.
With our standard remotes you could get appproximately 50mtrs taking into account line of sight to the gate and area interference. For a longer distance our long range option could get you up to 400mtrs.