The smartphone’s battery charging speed is one of the most important technical characteristics of modern mobile gadgets. Only recently, Samsung during the presentation of the Galaxy S10 5G introduced a 25 W charger, providing super-fast battery life recovery. However, already in the Galaxy A70, such a charge was included in the starter kit. Enthusiasts conducted a comparative test to determine the difference in the chargers that provide fast (15 W, previous generation) and super fast (25 W, new generation) charging. In the experiment, the Galaxy A70 was used with a 4,500 mAh battery and both chargers. The initial conditions were the same: 3% of the residual charge of the tested device. Control time for checking the charge level: 30, 45 and 60 minutes from the beginning of recharging. Superfast (25 W) memory showed the following results: half an hour – 33%, 45 minutes – 51% and 60 minutes – 67%. The fast (15 W) device showed the following results: half an hour – 26%, 45 minutes – 49% and 60 minutes – 60%. When charging the Galaxy S10 + with a 4100 mAh battery using a 15 W charger, other results were obtained: 34%, 52% and 67% of the charge. The test results showed that the charging speed of devices with different capacities differs by small values and is not proportional to the power of the chargers. Presumably, Samsung engineers deliberately reduce the charging speed to extend the battery life for a longer period. However, buyers will have to think about whether to pay extra when buying a new gadget for the claimed super-fast charge.