Should still be good if it's only a year and a half old . . . . but, problems like you're describing are frequently caused by a weak battery or one with poor connections.
What problems (if any) did you experience a year and a half ago that caused you to replace the battery?
2012 iMiEV SE Premium, White
2012 iMiEV SE, White
2017 Chevy Volt Premier
2014 Ford Transit Connect XLT SWB wagon, 14,000 miles
1979 Honda CBX six into six