https://batteryuniversity.com/article/bu-706-summary-of-dos-and-donts

Lithium Ion

Constant voltage to 4.20V/cell.
No trickle charge.
Battery can stay in a charger.
Rapid charge = 3h*
Fast charge = 1h

I'd need to verify but I believe lithium ion batteries are shipped <30% full charge per federal regulations. When you receive a new phone or other device with Li batteries, the manufacturer always instructs a recharge prior to powering up.