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Reserve Capacity (RC) indicates the amount of time a fully charged lead acid battery discharged at 25 amps will last before falling below 10.5 volts. In a perfect world this test is measured at 80F or 26.7C.
Odyssey and NorthStar Battery are great examples of a dual purpose AGM battery with a high Reserve Capacity.
Yes, battery desulfators work. Those who say otherwise either have not tested one and or work for a battery company and don't want to diminish sales. To read more on this subject read this blog post.
A Power Bank is an external and most often portable battery pack that is used to recharge your 5V electronic devices such as smartphones, tablets and game players. They can range in capacity from 2000mAh to 20,000mAh. Some are small enough to fit in your hand and resemble a tube of lipstick. Others can easily be stowed in your glove box or purse and fit in your pocket. Still others are thinly designed to sit under and connect to your laptop via the 18-20V output port. Depending on your capacity you can recharge your device once or a dozen times before needing to find an AC outlet.
Trojan makes both flooded conventional deep cycle batteries and sealed AGM deep cycle batteries. They also make a sealed flooded maintenance free battery. There are several differences in appearance: