I have a Sam's Club Duracell that has been in service I think going on five years now. Ford specs a group 65 size with 750 cold crank amps battery. If you're willing to live on the edge you could wait until the first time you need to use the AUX Start to get the engine going as a trigger to replace.
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2006 Hurricane 31D built on a 2006 Ford F53
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