Chally500

I have an 08' SRT8 and went to start it last saturday and key fobs did not work. when I push the start button, I get an error message that says 'Damaged Key'. Battery was dead, tried to boost, still no go. I'm trying to recharged the battery, but my smart charger gives me errors. I've tried a 2amp, 8amp and 12amp charge. Only seems to charge on 12amp but it's only up to 40% after a full day. tried the key fobs again, no go. Dealer says could be the module.
Any tips from anyone who had this issue?