Welcome to the world of RVing .... you'll enjoy it, I'm sure!
Your battery should have charged when you were plugged in to 110v, but there could be a problem with either the battery or the charging circuit. Could you have plugged in to 110v again to retract your slide? Usually, even if there is a battery problem, the 12-volt system should operate from the converter if you are plugged in. Do you have a cut-off switch for the 12-volt system? If so, be aware that it must be in the 'on' position to
charge the battery.
Kevin, Barb and Jake (the Golden/Lab Mix)
East Bolton, Quebec, Canada
2012 Infinity 3640RL
2012 GMC 2500HD Diesel