on the electric car parts co. website there is this page " https://www.electriccarpartscompany.com/BMS-Overview-Battery-Management-System ".
This is a good article. Like it states, balancing is a big issue. I have built a couple of Lithium Ion battery packs, both with quality passive balance BMS electronics.
concerning cycles I will give you a couple examples:
1. lead acid: it is considered a cycle if the battery is allowed to drop below 20%DOD
This on a battery with lets say 365 cycles if dropped below 80% charge every day would be a useless battery in one year.
2. A lithium battery with 100 cycle life discharged 10% each day would offer 1000 cycles
same lithium discharged 20% would offer 500 cycles.
it is cumulative meaning a battery that offers 1 amp capacity with 1000 cycle life will offer roughly 700 amps during its cycle life. (this assumes a calculation of 70% of the capacity is useable)
I hope this helps... remember that a battery pack that is not balanced can rapidly destroy a pack..
As a side line. a lithium battery pack is considered end of life when it will not produce 80% of it's original capacity. It is at this point that the pack is considered a fire hazard.
In answer to what I know use for my 24v system I threw weight to the wind. I am now using a battery called a Northstar blue series lead-carbon tech. According to the tech sheet I can get 2000 cycles at 50% discharge, and up to 7000 cycles under some conditions. For my use these are very positive numbers.
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