Plan your route before you leave.
Check that both batteries are fully charged.
If you are solo with a classic itinerary, allow about 40km per battery.
If you are riding solo and your ride is almost 50% uphill, allow 30km per battery.
If you are in a duo (without climbing), count about 30km per battery.
If you are a duo and your ride is almost 50% uphill, allow 20km per battery.