Good quality materials, solid construction. The LED light is not very bright and not focused, just a small work light. The button is a bit hard to press. It's not a mistake, but it's interesting that the product ordered from the CZ warehouse came from Poland. A bigger problem is the lack of packaging: the address sticker was simply stuck on the product's retail box. At least they should have put the product in a nylon bag to prevent accidental opening. Fortunately, in my case the retail box arrived unopened and in good condition. The device showed a full charge, the voltage was 14.24V. During a short functional test (without jump starting), the displayed charge decreased to 75% and then to 50%. Under a moderate load on the USB output (5.03V 0.83A) the discharge capacity was 1081mAh. The battery voltage dropped to 12.46V. After automatic power off, a full charge took roughly 5 hours (micro USB input, 5.07-5.09V, 1.55-1.6A), with an input charge of 7439mAh (about 37500mWh). Considering to the charging efficiency, I estimate the Ah capacity to be about 55-60% of what is described (about 1800-2100mAh per cell), but this is not surprising, given user reviews of similar devices (e.g. iMars J01). The area around the USB input warmed up slightly during charging (about 36-38°C at a room temperature of 19°C). The battery voltage when fully charged is 16.64V, which is ok (4.16V per cell for a 4S battery pack). I haven't tested the jump start function yet, but otherwise everything works perfectly. As a power bank, it is not competitive due to the lower capacity in relation to its size. In 17 days (without use) about 250mAh capacity was lost - in 3.5-4 months the charge level can drop to 75%. It is a good idea to check the charge level every three months.

Good quality materials, solid construction. The LED light is not very bright and not focused, just a small work light. The button is a bit hard to press. It's not a mistake, but it's interesting that the product ordered from the CZ warehouse came from Poland. A bigger problem is the lack of packaging: the address sticker was simply stuck on the product's retail box. At least they should have put the product in a nylon bag to prevent accidental opening. Fortunately, in my case the retail box arrived unopened and in good condition. The device showed a full charge, the voltage was 14.24V. During a short functional test (without jump starting), the displayed charge decreased to 75% and then to 50%. Under a moderate load on the USB output (5.03V 0.83A) the discharge capacity was 1081mAh. The battery voltage dropped to 12.46V. After automatic power off, a full charge took roughly 5 hours (micro USB input, 5.07-5.09V, 1.55-1.6A), with an input charge of 7439mAh (about 37500mWh). Considering to the charging efficiency, I estimate the Ah capacity to be about 55-60% of what is described (about 1800-2100mAh per cell), but this is not surprising, given user reviews of similar devices (e.g. iMars J01). The area around the USB input warmed up slightly during charging (about 36-38°C at a room temperature of 19°C). The battery voltage when fully charged is 16.64V, which is ok (4.16V per cell for a 4S battery pack). I haven't tested the jump start function yet, but otherwise everything works perfectly. As a power bank, it is not competitive due to the lower capacity in relation to its size. In 17 days (without use) about 250mAh capacity was lost - in 3.5-4 months the charge level can drop to 75%. It is a good idea to check the charge level every three months.

Good quality materials, solid construction. The LED light is not very bright and not focused, just a small work light. The button is a bit hard to press. It's not a mistake, but it's interesting that the product ordered from the CZ warehouse came from Poland. A bigger problem is the lack of packaging: the address sticker was simply stuck on the product's retail box. At least they should have put the product in a nylon bag to prevent accidental opening. Fortunately, in my case the retail box arrived unopened and in good condition. The device showed a full charge, the voltage was 14.24V. During a short functional test (without jump starting), the displayed charge decreased to 75% and then to 50%. Under a moderate load on the USB output (5.03V 0.83A) the discharge capacity was 1081mAh. The battery voltage dropped to 12.46V. After automatic power off, a full charge took roughly 5 hours (micro USB input, 5.07-5.09V, 1.55-1.6A), with an input charge of 7439mAh (about 37500mWh). Considering to the charging efficiency, I estimate the Ah capacity to be about 55-60% of what is described (about 1800-2100mAh per cell), but this is not surprising, given user reviews of similar devices (e.g. iMars J01). The area around the USB input warmed up slightly during charging (about 36-38°C at a room temperature of 19°C). The battery voltage when fully charged is 16.64V, which is ok (4.16V per cell for a 4S battery pack). I haven't tested the jump start function yet, but otherwise everything works perfectly. As a power bank, it is not competitive due to the lower capacity in relation to its size. In 17 days (without use) about 250mAh capacity was lost - in 3.5-4 months the charge level can drop to 75%. It is a good idea to check the charge level every three months.

The device arrived quickly. The assembly and materials used are good. Charging takes a long time. The first use is done, it does its job perfectly.

The device arrived quickly. The assembly and materials used are good. Charging takes a long time. The first use is done, it does its job perfectly.

The device arrived quickly. The assembly and materials used are good. Charging takes a long time. The first use is done, it does its job perfectly.