It’s generally safe for modern devices due to built-in circuitry, but it’s best to avoid it for long periods as it can stress the battery, slightly shorten its lifespan, and poses a small fire risk with faulty equipment or chargers, so use the manufacturer’s charger and unplug when fully charged if possible to optimize battery health and safety. 

HFH 3.7V 15ah 20ah 35C 70C high discharge rate Li Ion Nmc Prismatic Lithium Ion Battery

hfh-tech Prismatic aluminum Shell NMC battery cell is widely used in Electric vehicles, electric bicycles, tricycles, scooters, golf carts

SAMSUNG SDI leverages its innovative engineering to make high-capacity, energy-dense, and fast-charging batteries for EVs and PHEVs while pioneering automotive battery technology with the lead in developing and mass-producing all solid-state batteries – a force to be reckoned with in the battery industry for their …

HFH Samsung SDI94 Li Ion 3.7V 94AH NMC Lithium Prismatic battery cells

3.4V

Your 3.7V lithium ion battery can be considered dead (completely discharged) at a voltage of 3.4V. Your battery mustn’t discharge beyond 2.75V (minimum safe voltage), as it could reduce its life.

hfh-tech Samsung 94AH 3.7V Li Ion Battery 6000 Cycles 20+ Yrs Life ; Battery Capacity: 94ah ; Voltage: 3.7 ; Battery Type: Lithium-Ion ; Brand: Samsung ;