Nitecore USB Battery Charger Review
The Nitecore UM10 and UM20 chargers are a USB management and charging system for Li-ion/IMR batteries which is made by illumination tools specialist Nitecore/Sysmax. The UM10 and UM20 USB management and charging systems featured in this review were provided by Nitecore for the purpose of this product preview.
Both the UM10 and UM20 chargers are packaged in Nitecore branded blister packs with their recognizable brand colors of black and yellow. The single bay UM10 charger retails for $9.99-13.99, and the 2 bay UM20 retails for $15.99-19.99 at various online retailers.
NITECORE UM10/UM20 SPECIFICATIONS:
- Type: USB charger for Li-on/IMR batteries
- Input voltage: Micro USB DC 5V
- Output voltage: 4.2V / 1% / 5V
- Output current: 1000mA / 500mA
- Compatible with:
- Li-ion / IMR: 18650, 18490, 18350, 17670, 17500, 16340(RCR123), 14500, 10440
- Dimensions: 100mm / 38mm / 35mm
- Weight: 57 gram (without batteries or power cord)
- High Definition LCD display screen
- USB output charging
- Priority mode for battery or usb charging
- Enables data transfer via USB
- Charge current selection based on battery chemistry
- Reverse polarity protection
Like the I2/4 and D2/4 intelligent chargers, the UM10/20 USB management chargers are constructed from high quality ABS fire retardant materials. The UM10 USB charger shown below is a single bay charger, while the UM20 is a dual bay charger.
Both the UM10 And 20 feature a high definition LCD display screen, and include a micro USB charging cord with a built in cord winder at the base of the charger for storing the USB charge cord.
One of the things that I find to be most notable about the UM10/20 chargers is their compact size. Both chargers are smaller than the I2/4 and D2/4 series of intelligent chargers. The UM10 USB charger measures 3.94″x1.50″x1.38″ in size and 2.10oz in weight (no battery or cord). The UM20 USB charger measures 3.94″x2.20″x1.38″ in size, and 2.72oz in weight.
The base of the UM10 and UM20 chargers are hinged, and flips open to reveal the USB port underneath the charger. The included charging cord is a micro USB which can be connected with a micro USB capable external device, or into the micro USB input port at the top of the UM10 and UM20 charger.
The UM10/20 chargers have a switch for selecting priority USB or battery charging while in use. I will cover this feature in more detail later in the review.
FUNCTION AND PERFORMANCE
Before I cover the functions and features of the UM10/UM20 chargers in detail, here is a look at Nitecore’s promotional video which is an overview of the features and capabilities of the UM10 and UM20 USB management and charging system.
It is important to note that the UM10/20 USB chargers are only compatible with 18xxx, 17xxx, 16430, 14500, and 10440 rechargeable Li-ion/IMR batteries, unlike the I2/4 and D2/4 intelligent charger which can charge several different battery chemistries. Being an intelligent charger, the UM10/20 chargers are capable of automatically detecting battery type and can adjust charging to the appropriate charge current according to the battery type detected. Larger batteries will charge at a rate of 1A, while smaller batteries will charge at .5A.
The UM10/20 chargers are also capable of activating over discharged protected Li-ion batteries. However, Nitecore does not recommend charging zero volt over discharged unprotected Li-on batteries with the UM10 and UM20 usb chargers. If the UM10/20 charger detects a damaged battery which cannot be charged, the error code “EE” will be displayed on the LCD screen.
The UM10 and UM20 chargers have standard and advanced charge modes, as well as the ability to select ‘priority’ charging for the battery, or an external USB device. To use the standard function of charging Li-on batteries, remove the USB cord from the base panel of the charger and install the micro USB end of the cable to the input port. Then install the other end of the USB into a power supply, either a computer USB port or USB wall adapter.
When the UM10/20 is attached to a power supply the LCD display will illuminate and display an empty charge bracket and 0%. When a battery is installed in the charging bay the LCD display will indicate the batteries current charge level in percentage. The charge brackets on the left will also display a number of charge indicator bars which correspond to the current battery charge level shown in percentages. When charging is complete there will be 5 charge indicators bars and 100% displayed on the LCD display.
When using the UM10 and UM20 chargers in the advanced charge mode to charge both a battery and an external USB device, you most use a high power supply in order to charge both the battery and the external device simultaneously.
In the case of low power supply, this is where the priority mode settings on the UM10/20 chargers come into play. As previously mentioned, you can set the charging priority mode of the charger for battery or USB. The priority mode selection will determine which device charges first. Once the selected priority device has completed charging, then the UM10/20 charger will complete the charge of the second device.
The UM10 and UM20 chargers are also capable of acting as a data transfer medium between an external USB device and a computer while the external USB device is connected to the UM10/20 charger.
While the Nitecore UM10 andUM20 chargers have focused their marketing points around USB management alone, I honestly feel that the stronger selling point of the UM10 and UM20 is USB management charging system is their compact size and portability. The UM10 and UM20 chargers are considerably smaller than the Digicharger series and I feel that they are the perfect chargers for office or field work. Click here to check out our other recommended chargers.
Like all of the Nitecore branded charging systems, the UM10 and UM20 USB management chargers offer the same high quality, and accurate intelligent charging, which makes the UM10 and UM20 charger series easy to recommend.