What is the difference between a 60Ah and 70Ah car battery?

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70Ah has slightly more storage capacity, with longer discharge time compared to 60Ah which has shorter discharge duration. Below is an introduction to car batteries: 1. Conventional Battery: The plates of conventional batteries are composed of lead and lead oxide, with sulfuric acid solution as electrolyte. Its main advantages are stable voltage and low cost; disadvantages include low specific energy (energy stored per kilogram of battery), short service life, and frequent maintenance. 2. Dry-Charged Battery: Its full name is dry-charged lead-acid battery. The main feature is that the negative plate has high electricity storage capacity, capable of retaining charge for two years in completely dry state. 3. Maintenance-Free Battery: Due to structural advantages, maintenance-free batteries consume minimal electrolyte. They also feature shock resistance, high temperature tolerance, and compact size, typically lasting twice as long as conventional batteries.