Lithium Ion Batteries are a great maintenance free battery option. They're one of the best options available for renewable energy power storage due to their long lifespan - typically 10+ years (compared to a 5-7 year lead acid battery).
They are very efficient in cold weather and can tolerate a 100% depth of discharge. You can maximize your overall efficiency by using a lithium ion (also referred to as LiFePO4 or Lithium Ferro Phosphate).
If you have questions about lithium batteries or choosing the right battery for your system, you can call us at 417-708-5359.