Archive for the ‘Mobile USB Power Banks’ Category

One interesting compact power bank that doubles as a useful flashlight from Xiaomi that can be turn out to be quite useful gadget to keep in your car or bag wen you travel. The 3250 mAh Xiaomi Mi Power Bank Flashlight does not come with that big charging capacity, but you can also use the device as a flashlight with a 3W LED that has 11 levels of adjustable brightness and an SOS signal function. This power bank comes in a good looking compact aluminum body and an easy to use flashlight function that can be activated by turning the front of the device around. Specifications wise with the small capacity battery and the 5V/1A input and output you should to expect too much from it, though it can really be helpful in emergency situations to save the battery of your smartphone or actually to save you in case of real emergency where you can use the flash light functionality.

3250 mAh Xiaomi Mi Power Bank Flashlight Specifications:

– Battery capacity: 3250mAh, 3.63V, 11.8Wh (Li-Ion 18650)
– Input Voltage: DC 5.0V
– Output Voltage: DC 5.0V
– Input current: 1.0A
– Output current: 1.0A
– LED light: 3W LED, 11 levels of brightness, SOS function
– Size: 12.02 x 2.55 x 2.55 cm / 4.73 x 1 x 1 inches
– Weight: 104g

Since the 3250 mAh Xiaomi Mi Power Bank Flashlight is rated at 5V/1A output we have tested the battery at constant current load of 1A and the performance we get is quite good. The discharge curve looks great – stable at 4.85V voltage across the board and with close to 2000 mAh usable capacity. These little gadget is quite handy, though do to expect to have a full charge of the battery of your recent smartphone that may actually have a battery with twice that capacity, still it can help when you are in a pinch. And to tell you the truth we actually fell in love with the combination between power bank and flashlight in terms of functionality and the design and build quality of this device.

The performance of the 3250 mAh Xiaomi Mi Power Bank Flashlight in our tests:

– 1937 mAh at 1.0A load

– 9.381 Wh at 1.0A load

The Xiaomi Mi power banks are a popular affordable and good looking choice for mobile USB power banks, so much that they even get their own knockoffs with cheaper built and looking and worse performing variants from other Chinese companies. Here we have an earlier version of the Mi Power Bank 2 model number PLM10ZM that is a bit thicker than the latest version, but other than that should be very similar in performance and features like the newer thinner version that we are soon also reviewing here. With this model Xiaomi has managed to provide you with a decent capacity of 5000 mAh in a slim and lightweight package with great looks and an attractive price. Slim yet sturdy aluminum case with a number of safety features built into the electronics as well as power check button with LED indicator lights and USB charging connector with 2A input for faster charging time and USB port with output current of maximum 2.1A.

5000 mAh Xiaomi Mi Power Bank 2 (PLM10ZM) Specifications:

– Battery type: Lithium-ion Polymer rechargeable cell
– Input Voltage: DC 5.0V
– Output Voltage: DC 5.1V
– Input current: 2000mA (TYP)
– Output current: 2100mA (TYP)
– Rated capacity: 3.7V / 5000 mAh / 18.5 Wh (TYP)
– Charging time: 3.5 hrs with 5V/2A plug and standard cable
– Size: 127 * 68.9 * 10.7mm
– Load detection: Auto-detects device plug-in/plug-out
– Safety: Supports protection from over-voltage (input and output), over-current (input and output), short circuit, over-charge, over-discharge, and battery Positive Temperature Coefficient (PTC)
– Out of power protection: Awake once plugged to the charger
– Charging temperature: 0C-45C (TYP)
– Discharging temperature: Initial -20C~+60C (TYP)
– Weight: 156g

With the 5000 mAh Xiaomi Mi Power Bank 2 (PLM10ZM) we have performed our usual 1.0A and 2.0A constant current load tests and you can see the results on the discharge graph above. At 1.0A discharge load we get a stable output voltage of about 4.93V and a little over 3300 mAh usable capacity and this is quite good and confirms the minimum 3300 mAh actual output claimed by Xiaomi for this product. At the higher 2.0A constant current discharge however things do not look as good for this power bank, because not only the output voltage is lower, but it also fluctuates a lot as you can see between 4.5V and 4.68V resulting in significantly lower Wh output for the battery at higher load. Hopefully this has been addressed in the newer slimmer version of the power bank and this is something we are hoping to confirm soon as we kind of expected better performance at 2A loads.

The performance of the 5000 mAh Xiaomi Mi Power Bank 2 (PLM10ZM) in our tests:

– 3306 mAh at 1.0A load
– 2921 mAh at 2.0A load

– 16.30 Wh at 1.0A load
– 13.50 Wh at 2.0A load

The TP-LINK TL-PB50 is a 10 Ah power bank with dual USB device charging option featuring a single 1A 5V USB and one 2A 5V USB ports. The mobile power bank is compatible with a number of different mobile deices such as smartphones, tablets and other gadgets that can be charged through standard USB ports with 5V. The PB50 power bank is equipped with a chip that lets it identify iOS, Android, and other USB devices and charge them at the fastest possible speed up to 2A. The battery inside the power bank is a single cell 10000 mAh LG-made Lithium-Polymer battery with a 500-charge lifespan according to TP-Link. The device is equipped with a short circuit protection, over-voltage and over-current protection, over-charge and over-discharge protection as well as an over-heating protection with a thermal sensor attached to the battery cell.

TP-LINK TL-PB50 Specifications:

– Capacity: 10000mAh
– Input: 5V/2A
– Output: 5V/1A, 5V/2A
– Lights: Battery level indicator (4 LED lamps)
– Compatibility: iPhone, iPad, most Android devices
– Size: 139.7×78.9×19.3 mm (5.5×3.1×0.76 in)
– Weight: 281.3g
– Package contents: TP-LINK 10000mAh Power Bank PB50, USB-Micro USB cable, User Guide, Carrying Pouch
– Battery Type: Lithium Polymer
– Ports: Dual USB 2.0 Ports
– Recharging Time: 1A – 9h32min, 2A – 6h8min

Here is how the discharge curve looks for 1A discharge and for 2A discharge from the power bank and the capacity you can expect to get out from the 10 Ah mobile battery, pretty much the same graph in both cases with very little voltage fluctuations, apart from the slight difference in usable capacity. With 1A discharge the usable capacity is slightly higher at 7371 mAh or 35.74 Wh, while with 2A discharge you can expect to get 7073 mAh or 34.34 Wh. That is slightly more than 70% from the battery cell capacity and this is considered a good result for a power bank where the input comes from a single cell 4.2V LiPo battery (when fully charged) that gets its voltage dropping lower as it gets discharged and a step up power converter needs to manage the output voltage stable at about 5V. The discharge curve in our tests shows a very stable output voltage up until the end of the discharge cycle and that is a good sign.

The performance of the 10000 mAh Power Bank TP-LINK TL-PB50 in our tests:

– 7371 mAh at 1.0A load
– 7073 mAh at 2.0A load

– 35.74 Wh at 1.0A load
– 34.34 Wh at 2.0A load