I should say that I have a one year old, group 29, Walmart, marine battery mated in parallel with 4 year old, group 27 Harris battery (original) and all is well. The old Harris battery developed a shorted cell after 3 years. The charger is a PPC 5355 with a 4400 temperature assure upgrade (TAU).
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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