YES you need to be concerned!!
Visible fumes coming from battery, battery hot to touch.
TURN OFF converter, disconnect battery (Ground cable first)
You have a bad battery...probably shorted cell
AND your converter may be overcharging.
BUT get that battery disconnected before it explodes.
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31