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Before getting into anything major, I'd suggest thinking about trying a few simple things.
1) Just because your 12-volt battery looks new doesn't mean that it is. If it was at zero volts for a while, it might be trash. The car won't start or run without a halfway good 12-volt battery.
2) If it cranks with the starter, that means the system thinks the IMA pack doesn't have charge. That doesn't mean that it's dead, just that it's discharged.
3) For the P1445 code, that should clear if you disconnected the 12-volt battery. (Or pull the #18 fuse from the box by the driver's left knee and wait 10 seconds.)
4) If you get the engine running, it should show the IMA battery charging (green bars on the gauge), and battery charge should eventually climb to full.
5) It won't use the IMA much at all when the charge level is low (say below half), and without IMA the engine IS pretty weak (or can seem so to someone not used to an Insight). There may not be anything wrong with the engine at all, just your perception. If there is, it's an engine just like any other, and you'd diagnose problems just as you would for any IC engine.
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