Victron 12.8 Volt Lithium Ion Phosphate Batteries

In several applications (especially off-grid solar and/or wind), energy efficiency can be of crucial importance.
The round trip energy efficiency (discharge from 100% to 0% and back to 100% charged) of the average lead acid battery is 80%.

• The round trip energy efficiency of a LFP battery is 92%.
• The charge process of lead-acid batteries becomes particularly inefficient when the 80% state of charge has
  been reached, resulting in efficiencies of 50% or even less in solar systems where several days of reserve energy
  is required (battery operating in 70% to 100% charged state).
• In contrast, a LFP battery will still achieve 90% efficiency under shallow discharge conditions.

DATASHEET:Datasheet-12,8-Volt-lithium-iron-phosphate-batteries-EN