If it's the original battery then it wont have much life left.  However dropping voltage to cause gearbox and other faults whilst driving then being OK later wont be caused by a battery failing to keep its charge but could be due to an internal break in the battery.  Another possibility is an intermittent short circuit in wiring somewhere causing excessive current draw which may take some finding although as circuits are fused the cable would have to be heavy, such as the starter cable.  Monitoring the voltage whilst driving and especially during one of its episodes might provide a useful clue.
				
			 
			
		 
			
				
			
			
				MY21.5 L405 D350 Vogue SE with 19s.  Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
			
			
		 
	
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