
The "4S" in a 4s lipo battery signifies that the battery pack consists of four individual Lithium Polymer lipo battery cells connected in series.Each of these cells has a nominal voltage of approximately 3.7 volts.When connected in series, their voltages combine, resulting in a total nominal voltage of 14.8V (4 x 3.7V).This is a significant jump from the more common 3s battery, which has a nominal voltage of 11.1V, or a basic lipo battery 3.7 v. [pdf]

Here are the key specifications and features of this model: Key Features Power Range: 625 to 650 watts peak (Wp) Cell Type: Bifacial monocrystalline N-type PERC cells Cell Size: 182mm x 182mm Panel Efficiency: Up to 21.3% Bifacial Ratio: 70% Power Gain: Up to 30% additional power from rear side irradiation Power Temperature Coefficient: -0.35%/°C Warranty: 25 years at 86.2% output power, 30 years at 81.2% output power [pdf]
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