Top positive review
The red clamp on the Smart Start Clamp was broken when I recieved the product
January 12, 2016
The red clamp on the Smart Start Clamp was broken when I recieved the product. I tried gluing the clamp back together, but I don't know how long that will hold. The battery itself is fine so far, but I'm very disappointed in the quality of the camp.
EDIT: They quickly contacted me about my issue and offered to send a replacement cable for free, as well as a small reimbursement. I'm happy with how the situation was handled on their end.
From the time of my purchase, I thoroughly tested the DBPOWER Jump Starter. I was wondering what the real capacity of the battery was in this device. I charged the DBPOWER power bank 5 times and each time I used it to charge my iPhone 6s and iPad Air 2. To measure the passing capacity of the battery, I used the PowerJive tester. I verified the validity of the measurements put out by the tester with the known capacity of the batteries in the iPhone (1715 mAh) and iPad (7340 mAh).
The measurements obtained the following data:
1st time DBPOWER measured 6651 mAh
2nd .......................................... 6825 mAh
3rd ........................................... 6930 mAh
4th ........................................... 6458 mAh
5th ........................................... 6825 mAh
The average battery capacity of the DBPOWER DJS10 was 6738 mAh, and not 12000mAh as the manufacturer says. This is 56.15% of the claimed capacity!
As for the appearance of the DBPOWER Jump Starter and boxes used for transport and storage of the battery, I do not have any complaints!
The materials used to make the DBPOWER starter and its boxes are of high quality and are pleasant to the touch. The battery and boxes were constructed neatly and look appealing!
I also had a problem with a clamp to the positive terminal of the battery. It was already broken when I received it. I was offered a replacement clamp and a $10 refund to my account, so that was nice. I think the quality of the material from which the clamp is made is not very high. Perhaps this is a manufacturing defect. The actual design of the clip (minus the central axis) doesn't seem to be very strong.
After 23 days, I got new battery clamps. Unfortunately I had some inconveniences this time as well! In the box were clamps and two separate halves of the protection unit of the red wire! I thought that it was broken for good, but it turned out they are easily snapped back together. I was able to quickly fix it, but the fact remains.
I also tested the DBPOWER as a jump starter to start a car with a dead battery. In this test the DBPOWER device proved excellent! In total I started the car 25 times!!! The car being started had a 2 liter, 4 cylinder engine. The experiment was conducted over the course of six days. The DBPOWER jump starter stayed fully charged for two days. The first time I started the car was at a temperature of 32 * F (0 * C). Two days later I started the car 15 times in a row! I took a small pause (about 30 seconds) between starts. After these tests, the jump starter remained cold. The protective system for the wires was slightly warm. The DBPOWER device had about 70% of its charge left (3 LEDs lit). The next day I continued the experiment. I started the same car 5 more times in a row (with small breaks in between)! Two days later I started the car 4 more times!
After all these grueling tests, the DBPOWER jump starter was at about 70% of the charge (3 LEDs lit). From the DBPOWER device I charged my phone twice more (not all the way). In total it took 2179 mAh.
Once the device was fully charged, I used it to charge my phone and tablet. At full discharge the jump starter gave out 6649 mAh.
To summarize, I can say that the real capacity of the battery in the DBPOWER jump starter did not exceed 6723 mAh (after 6 measurements) and certainly isn't 12,000 mAh! This is about 56% of the declared capacity! That's the battery capacity you should expect when it's used as a power bank. But as a jump starter, DBPOWER device is simply magnificent! I do not know how it will behave when trying to start more powerful engines, but I think it won't let you down.
PS: I also tested a jump starter from the company PILOT BULLY. After several attempts, I was able to start a car with an engine size of 2 liters and 4 cylinders only twice (and with a big break in between starts). Any other attempts resulted in the safety light coming on. This jump starter got quite hot.