Charger's are rated for the primordial times of lipo with 4.20V top voltage.
There are a new ones that says that are HV that charge lipos to 4.35V but need to use specific HV lipos. That is a new business and those lipos do not have the life of a normal lipo. Less then a quarter. A thing that will dye soon in my opinion...just like those things CDInteractive by Philips.... in the 90's...

So back to normal lipos....
Always balance charge them? right?

Storage mode is simply in 3.85v range. Just storage charge or balance charge a full fack and play on the car half the time....lipos will be on 3,80v something. Ready to store for months...

If leave a batery fully charged for more then 3 days...she is dying fast....could sweell faster and not holding charge anymore....

Always charge them on a lipo bag or at least on concrete floor with nothing to burn close by. THERE ARE HOUSES that burned cause of silly lipos charging anatended....whatch youtube, just like to see rc's...to see burn houses cause of lipos....

Ever think not to put matches close to Nitro or Gas? Well, lipos are same thing in another aspect's...always balance charge and always 3,85v for storage and in a lipo bag, or metal container!