UTRAI Power Bank 4000A Jump Starter Portable Charger Car Booster 12V Auto Starting Device Emergency Car Battery Starter

During extended use, the device proves reliable — reviewers purchase it repeatedly or recommend it to friends. Charging takes approximately one hour with a more powerful charger. The display shows charging mode and capacity. The flashlight has four modes including a red-blue beacon. Wireless charging works. The device holds its charge — some buyers received it charged to 74–76% and capacity remained stable after recharging.

The main concern relates to capacity — reviewers note that actual capacity (59.2 Wh, approximately 2500 A peak current) is lower than the 4000 A designation suggests. One buyer with a 5000 mAh phone could charge it only twice. Another criticized that the device feels cheap and light, though the starting function works. Negative ratings comprise only 1.9% — most criticism concerns the discrepancy between declared and actual capacity.