You do not replace batteries because of their age, you replace them because they test bad. That said five years is pretty good
Ask them what test they did. Did they do a discharge test? Is it one battery or all? Certainly possible that 5 year old batteries have lost their mojo..... Asking them to describe the test may give some confidence.
Even if they are bad, call Battery Boys or Spano for pricing. I think I paid $740 for 6- Trojan 890s which is a higher end 8 volt battery.
At a minimum, if you can or if you know someone who can help, you should get the voltages of the batteries when this happens. Each battery.... That will likely tell the answer about the batteries. Depending on the answer would determine the next step.
I always recommend 'c+a+r+t__f_i_x_e_r' listed in the paper.
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