5000 mAh Lenovo PB420 Power Bank Test

4 Apr

Lenovo is not know much for its mobile accessories an they have never been a focus of the company, but still it is making them as a part of their mobile accessories product lines. We have picked up one of the company’s power banks to check it out and it does not seem bad at all both in terms of specifications (See below) and features. The PB420 Power Bank is compact in size device with aluminum and plastic case, a single USB output and single micro USB input port and a LED charging indicator. The device looks and feels nice in overall and seems to be durable, though we have not specifically tested it out for durability. Even though it is using just 5000 mAh LiPo battery inside it can take a charge with 1.5A current and can output up to 2.1A for charging other mobile devices.

5000 mAh Lenovo PB420 Power Bank Specifications:
– Battery Power Capacity: 5000 mAh, 3.8 V
– Life Cycle: >300 Cycles
– Battery Cell: Polymer Battery
– Input: Micro USB 5 V / 1.5 A
– Output: USB Port 5 V / 2.1 A
– Cell Package: Single Cell – 1P1S
– Dimensions (W x D x H): 119 x 66 x 8.9 mm, 4.7″ x 2.6″ x 0.4″ inches
– Weight: Starting at 0.3 lbs (150 g)
– Colors: Black, Silver

We have tested the 5000 mAh Lenovo PB420 Power Bank with 1.0A constant current discharge and with 2.1A as well and in both cases the useable capacity in mAh is pretty high. Thanks to the high voltage output that stays close to 5V and does not drop much even at 2.1A load (~4.87V average) the capacity in Wh also is pretty high for a 5000 mAh power bank. What was a bit unexpected was the fact that the battery case gets a bit hot during higher current discharge which we did not expect to see happening with a power bank. Using a Lithium-Polymer battery cell with just 2.1A normally should not lead to the battery getting hotter, but the temperature is well within the problem-free zone and it does not seem to affect functionality in any way, so it should not be a problem. We should also note that so far this is the best 5000 mAh power bank in terms of useable capacity that we have tested so far, though we have just tested a few so far and we need to get more results for a proper comparison.

The performance of the 5000 mAh Lenovo PB420 Power Bank in our tests:

– 3571 mAh at 1.0A load
– 3234 mAh at 2.1A load

– 17.75 Wh at 1.0A load
– 15.72 Wh at 2.1A load

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