Battery problem

[Bob]

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.

Thanks for any help.

As far as I am aware AGM Batteries should not be used as Cranking Batteries.
Check out this and read all the way down
https://www.australiandirect.com.au/...teries/KA12120