Into Gear's premium range of motorcycle battery maintaining and charging units come from the best in the business, Optimate. 
Connects to the SAE battery lead that you plug your optimate in to.
AND - It won't flatten your battery - Built in protection turns off USB charging & prevents your parked vehicle’s LFP (LiFePO4) or AGM (Pb)battery from draining – Starts back up when vehicle engine fires up.
Charges your USB device with up to 2400mA current available (or get optional O-110 USB splitter and charge 2 devices). – Charge current adapts to connected device for safe recharging.
Creates weatherproof seal against inserted USB cable, or ‘rideproof’ cap seals when not in use – Worry free phone, camera or GPS charging in any weather!
Bonus feature: Monitors and displays parked vehicle’s battery status – indicates battery is ‘start ready’ at the blink of an LED!