The car should unlock manually if you put the key in even with a dead battery.
The remote unlock won't work of course
As the car normally starts from the IMA battery you won't notice that the 12V battery is getting worse until it is too late.
Best to monitor the 12V battery voltage on a regular base, like with a cigarette plug volt meter or an OBDII plug tool like the UltraGauge, set to display battery voltage on one of the gauges. I did that.
2011 Insight Elegance
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Accord horn, Waxoyl, HIDs, Green Oil, UltraGauge, LEDs, full upper&partial lower grille block, aero tweeks, plans for several eco mods