2011 Honda Insight EX body style 155,000 Miles. Bought used in 2014 with 55,000 miles. IMA & CEL on if driven too long then Battery light also comes on. Code P1448. Tried grid charger and shows battery has full charge will drive great for 10-30 miles then lights come on again. IMA Battery charge drops fast but charges again. If driven too long and IMA/CEL lights on will stop showing charging in charge/assist info left of gauges but will show the "car" icon charging the "battery" icon along with the "gas" icon and "battery" level low/medium/full charge and working properly in info center. New 12v battery installed within past 4 mos. Everything points to bad IMA Battery. Looking to buy a new battery and do a DIY install. I am having trouble finding written or video on how to install IMA battery. Does anyone have any info on installing a new battery? Help would be greatly appreciated.