I'm running a standard Sans 42Volt 2 amp charger as supplied with an Oxygen S-Cross w/ 36V 13amp battery. I understand the Sans from google search is a basic/ cheap charger. The bike is a year old and had covered 40 miles when I purchased it. I have put another 80 miles on it since ownership. Charger outputs 42.1v (tested with multimeter) and has successfully (on 3 occasions) charged the battery up to 42v . Charger shows green light plugged into mains only/ red light during charge/ green light at finish. Did notice the charger was getting particularly hot to touch during charging so I raised it on a wire baking tray in attempt to assist with airflow. Also I noticed that the final stage of charge ramping down took 90mins! determined with my plug in watt meter which btw is a great way to know what the charger is up to Unfortunately the charger failed to charge the battery on the last charge & just stayed on green light when connected to battery....I didn't realise this untill following days ride where I had been lazy to check final volts! Have taken a look at the inside of the charger but cannot see any obvious evidence of blown components UPDATE More luck then anything else .....after connecting and disconnecting the battery a few times this afternnoon I saw a brief red flicker from the charger and now it appears to be back up and running again. I've left the top section charger case off to assist with the heat issue and am carefully monitoring battery charger with my watt meter as well as battery volts with multimeter. Will update how the rest of the charge goes...... and will definite not be using this charger unattended Has anyone else similar issues / fixes/ modifications of this charger?