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I have a 10 month old Super Charge AGM which I use as my crank battery. I used the car on Sunday and all was fine. I hopped in it on Friday and it was completely dead.
I jumped it off the second battery and drove for 20 mins at 100kmh. Once I stopped at the end of the trip I tried to start the Patrol again & it was totally dead again.
Got home last night and charged it on a Noco smart charger for 12 hours. The charger said it was back at 100% charge. I removed the charger and measured the battery and it was 12.0x. I watched as the voltmeter dropped down to 11.4.
I just completed a trip across the Anne Beadell Hwy which was a total shake test with very severe corrugations & I'm wondering if this may have caused my problem, although I had no problems for at least a full week after getting off the AB Hwy.