A lithium-ion battery has a nominal voltage of 3.7 volts per cell. When connected in series, the total voltage increases by 3.7 volts for each cell. This configuration allows for different battery pack designs.
[pdf] A fully charged lithium-ion battery typically measures between 4.1V and 4.2V per cell. This voltage range represents 100% state of charge (SOC), and it’s the maximum safe limit for most standard lithium-ion chemistries. Charging beyond this level risks battery damage or safety hazards.
[pdf] The nominal voltage of the 14-string battery pack is 3.6V*14=50.4V, and the current is 1000W/50.4V=19.84A (excluding loss and conversion rate). As the voltage increases, the current will decrease.
[pdf] 
