Use Duracel Chris,all those bunnies can't be wrong?You might also check the connectors for corrosion etc.The MCP (inevitably?)has a rather sophisticated standby supply circuit,that can confuse the issue,and suggest low batteries.I've had some panels over the years that seem to "eat" batteries,due to various internal maladies.
Try some new batt's first tho'
Regards,
Nick