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High Voltage Cells

Lithium-ion Polymer (LiPo) battery cells with normal voltages are fully charged at 4.2V while high-voltage cells are at 4.35V. 4.4V, or 4.45V. The nominal voltage of normal-voltage cells is at 3.6-3.7V while the nominal voltage of high-voltage cells is at 3.8V or 3.85V. High-voltage batteries have only just begun to be used in large-scale market applications.

High Voltage Batteries

Why High-Voltage Batteries?

The energy density of a battery reflects the battery’s capacity for energy storage per unit volume. It is the product of the nominal voltage and the capacity of a battery divided by the volume or weight of a battery. Based on the limited space and weight of the power supply, the battery energy can be boosted by increasing the charging voltage, which is where we see the fully-charged voltage increase from 3.7V to 3.8V or even 3.85V. This method is mass producible, and the battery capacity can be increased by about 15%.

1C Discharging

Everyone wants to increase how long devices can operate at one time, and pilots of drones are no exception with their desire to increase their flight time. If drone batteries cannot meet the demands of the very drones they power, then batteries themselves can inhibit the development of the drone industry.
For example, the flight time for a standard 22.2V or 44.4V battery in an aerial survey drone will be around 30-50 minutes. However, this flight time can increase and provide better efficiency to the device with our high-voltage batteries.

1C Discharging

The graph above reflects the difference in capacity between three fully-charged batteries at 4.2V, 4.35V, and 4.4V.

Why Choose Grepow's High Voltage Batteries?

High-voltage batteries have high energy density and high discharge platforms. They can also deliver more capacity under the same conditions of use, so their battery life is longer while delivering more power. Under normal circumstances, the lifetime of Grepow’s high-voltage batteries will increase by 15-25%.
Below is a summary of the benefits of using our high-voltage batteries:

High energy density and longer battery life: 15% higher than ordinary batteries;

High and stable discharge platform: Frequent use does not affect the battery life as much as ordinary batteries’;

Even after 300 cycles, the batteries can still provide 80% of its original capacity;

Based on real-life applications, the batteries can still meet the service life of 3 years, operate under high and low temperatures, and meet different rate requirements of the power industry;

Mass producible and good cell consistency.

High Voltage vs. Normal Batteries

Model Voltage(V) Weight(g) Capacity(mAH) Volumetric Energy Density(Wh/L) Weight Energy Density(Wh/Kg)
4.2 49.4 2950 454.34 220.95
4.35 50.5 3150 498.25 237.03
4.4 52.1 3500 560.90 258.64

As shown from the table above, the volumetric and weight ratio of the high-voltage batteries is increased by about 18%.

High Voltage vs. Normal Batteries

You can see here how the high-voltage 4.4V battery (marked in green) has a higher rate discharge platform and higher discharge capacity.

Discharge Rate Comparison

Due to the higher capacity of the 4.4V batty, the same current cycle can be used to reduce the actual discharge rate of the battery and extend the battery life. At the same number of cycles, you can see how the 4.4V battery has a higher percentage of its original capacity remaining compared to the 4.2V battery.

Sample of Battery Cells and Parameters

Model C-Rate Capacity(mAh) Voltage(V) Weight(g) Thickness(mm) Width(mm) Length(mm)
GRPA030072 8 2700 4.35 45.0±1.5 9.7±0.3 30.0±0.5 72.0±0.5
GRP9130088 8 3070 4.35 50.5±1.5 8.8±0.3 30.0±0.5 88.0±0.5
GRPB042104 5 7100 4.4 102.0±3.0 10.7±0.3 41.5±0.5 103.5±0.5
GRP8674133 5 12000 4.4 176.0±5.0 8.3±0.3 75.5±1.0 132.0±1.0
GRP9435062 40 1650 4.35 39.0±1.5 9.1±0.3 35.0±0.5 63.0±0.5

Applications of High Voltage LiPo Batteries