This post will be about batteries. ALL types!! There are literally DOZENS of battery chemistries out there. I will talk here about the 6 or 8 MOST USED types, and let you know which are the best, and which are the most expensive. Funny, it’s not just the purchase price that matters,… From a common sense standpoint, the battery LIFE is important and the right way to calculate cost is on a $ per charge/discharge cycle over the guaranteed LIFE of the battery. This makes the most sense and is the most accurate way to figure things. I’m a bit pressed for time, so please come back in a couple days and I’ll have some HONEST impartial battery information for all you data hungry solar enthusiasts!!