Metro, just do what I did until I got a suitable charger for my ev, wire it in straight into the 220v through a diode or bridge with a resistor AKA 110v bulb.
It will literally take you $5 and 5 minutes to assemble and although inefficient its still probably less expensive than not charging. Gas is more than 0.25 cents of electricity (if that)
3 Dollar Battery Charger
If you already have a killowatt and one of those ac timers you can safely use one of these to slowly top off your pack each day.
Just keep the exposed terminals inside and use a Ground fault outlet.
And if you want to take 10 minutes and $20 use a motor run cap instead of the resistor with a bridge and it will be efficient.
No less safe than the typical non-isolated chargers.
Have fun.