preface
Previously, the charging head network evaluated the Knight Cole NL2150 HPR USB-C direct charge lithium battery for everyone, and the NL2150 basic model of the same series was also unveiled, similar in shape and performance, the USB-C charging port was cancelled. This time, I buried the pit left before, and also gave this 21700 lithium battery a little care. Without further ado, go on the test.
Unbox
The packaging of the two batteries is similar, and the packaging style of yellow and black color matching is quite hardcore.
Also 5000mAh, up to 15A current output. The back is designed for easy to detach.
Although the two batteries are 21700 specifications, but due to the USB-C interface, the length is a bit different, pay attention to compatibility issues when purchasing.
The Knight Cole NL2150 lithium battery has a capacity of 18Wh and a rated voltage of 3.6V.
The back is printed with precautions for use, such as avoiding use in a humid environment, paying attention to the input voltage when charging, and staying away from the dangerous environment common to lithium batteries such as high temperatures.
The negative embossing of lithium batteries is printed with the words NITECORE.
The positive pole is shown above.
The length of the Knight Cole NL2150 lithium battery is about 74.95mm (the terminals are insulated, and normal use should never be short-circuited like this).
The diameter is approximately 21.6mm.
Compared with the ordinary AA battery, the size is compared.
And 18650 compared to the size.
Compared with the size of the conventional 21700 battery, the part that grows out is the circuit board.
And 26650 compared to the size.
The weight of the lithium battery is about 76.6g.
Voltage and internal resistance
The voltage measured by the battery when fully charged using a multimeter is approximately 4.179V.
The internal resistance of the battery tested with EB is 29mR at an operating current of 1A.
The internal resistance at 2.5A is 28.4mR.
The internal resistance at 5A is 28.8mR.
Charging test
A constant voltage DC power supply is connected here to charge the lithium battery. The lithium battery starts with a starting voltage of 3.165V, a termination voltage of 4.2V, a charging current of 4.2V1A, an input energy of about 4556mAh, and a full journey of about 5 hours and 3 minutes.
The lithium battery starts with a starting voltage of 3.025V, a termination voltage of 4.2V, a charging current of 4.2V2.5A, an input energy of about 4661mAh, and a full journey of about 2 hours and 34 minutes.
The lithium battery starts with a starting voltage of 3.076V, a termination voltage of 4.2V, a charging current of 4.2V5A, an input energy of about 4632mAh, and a full journey of about 1 hour and 47 minutes.
Discharge test
Connect the battery to the device and measure the discharge curve and actual capacity of the battery. The starting voltage of the battery is about 4.2V, the termination voltage is about 2.6V, the whole current is maintained at 1A, and the actual discharge capacity is about 4746mAh.
The starting voltage of the battery is about 4.191V, the termination voltage is about 2.6V, the whole current is maintained at 2.5A, and the actual discharge capacity is about 4649mAh.
The starting voltage of the battery is about 4.177V, the termination voltage is about 2.6V, the whole current is maintained at 5A, and the actual discharge capacity is about 4614mAh.
Charging head net summary
Knight Cole NL2150 lithium battery and the same series with USB-C charging port NL2150HPR, has a battery capacity of 5000mAh, due to the removal of the USB-C interface, the length of the battery is about 1.1mm shorter, in the purchase need to pay attention to the compatibility of electrical appliances.
In the actual test, the maximum discharge of 4746mAh energy at 1A current, counting the loss of the battery buck and boost, basically in line with the labeled capacity. With a charging current of 5V, it can be fully charged at 1 hour and 47 minutes at the earliest. In the outdoor use of high-power lights, power tools, easy to remove the 21700 battery is not only easy to carry, higher energy density also for travel burden, and this lithium battery 5000mAh large capacity is definitely in the same kind of products can be regarded as the best.