Glad you asked. On the smart cane handle is a small LED light. It flashes green, red or blue. It glows green when your cane is fully chargedwhile plugged in. It flashes red when the cane is either not connected to your cane, or is solid red when it's being charged. You'll see a flashing blue light when the cane is connected to your smart phone.
To see if your battery is low, check the mobile app. Also, if the cane is charging but not connected to your smart phone, it will glow green with intermittent flashes of red, this is normal.