Check your WFCO converter model number: WF8735/P - Not for lithium batteries (charges to 80%)WF-8735LiS - Has switch for charging lithium batteriesWF8735-AD - Auto Detects for charging lithium batte… (View Post)
Days or weeks does not make any difference with LiFEo4 batteries. Long term (several months, over Winter) you can store them at any level you want but 50% is usually recommended. (View Post)