Nowadays, people carry more and more digital devices in daily life, and different electronic devices are equipped with exclusive rated supply voltages. Single fixed-voltage power banks can no longer meet multi-device charging demands. Most ordinary power banks on the market only support one single voltage or two fixed fast charging gears with narrow voltage coverage, which often causes voltage mismatch problems. Supplying high fast-charging voltage to low-voltage small devices will directly burn out mainboards and built-in batteries; while supplying low voltage to high-power laptops and vehicle devices will lead to insufficient power supply, repeated black screen restart and startup failure. Carrying multiple dedicated chargers for different devices makes the backpack bulky and brings great charging burden during travel. Based on the original power supply parameters and power protection demands of various digital devices, this power bank portable charger multi voltage output is equipped with a full-range multi-gear voltage output system. It accurately fits the original factory power supply standards of almost all civilian digital devices, and provides one-to-one exclusive voltage power supply solutions for four categories of electrical equipment: low-voltage precision accessories, mobile phones and tablets, vehicle and photographic equipment, and thin-and-light laptops. It thoroughly solves core pain points including device damage caused by voltage mismatch, incompatibility of one single power bank for multiple devices, and trouble of carrying various chargers, enabling one power bank compatible with all kinds of digital devices.

　　For the first category of low-power precision small digital devices, including Bluetooth earphones, smart bracelets, wireless mouse and keyboards, voice recorders, mini routers, nail lamps and desktop mini fans, all of them adopt standard 5V low voltage as original factory rated power supply. Such devices have no internal high-voltage buffer circuits and cannot withstand impacts of high voltage such as 9V and 12V. Accessing high-voltage fast charging current will directly damage internal precision chips and cause permanent device failure. This power bank portable charger multi voltage output automatically identifies low-power devices and switches to accurate 5V regulated voltage output. It provides mild and stable current output fitting the original power supply logic of small devices without high-voltage pulse impact. It can not only replenish power stably, but also protect precision electronic components in all directions, extend the service life of niche small digital devices and avoid irreversible hardware damage caused by high-voltage fast charging.

　　For the second category of mainstream smartphones and tablets covering all Apple and Android models, their native fast charging protocols adapt to standard 9V fast charging voltage. Ordinary fixed 5V power banks only support slow charging and double the charging time; inferior fast charging power banks with fluctuating voltage will trigger phone charging protection, cause frequent fast charging disconnection and abnormal body overheating, and accelerate mobile phone battery aging in long-term use. This multi-voltage power bank can automatically identify fast charging demands of mobile phones and tablets, switch to 9V fast charging gear seamlessly and match native device fast charging protocols. It maintains constant voltage output without fluctuation during the whole fast charging process, no charging pop-up prompts, no intermittent connection and low-temperature operation. It guarantees fast charging efficiency while protecting mobile phone battery health perfectly, suitable for high-frequency power supply scenarios such as daily commuting and outdoor travel.

　　For the third category of vehicle and outdoor photographic equipment, including driving recorders, vehicle aromatherapy machines, portable fill lights, outdoor monitors and external power supply bases for DSLR cameras, these devices require stable 12V medium and high voltage for continuous power supply. Low-voltage power banks cannot drive these devices normally, and unstable high voltage will lead to screen flickering, video recording interruption and program crash. This product automatically switches to 12V constant voltage output without voltage drop and current fluctuation under full load. It meets the demand of 7×24-hour uninterrupted standby power supply, adapting to strict scenarios such as all-day vehicle power supply and long-time outdoor shooting, and ensures stable operation of professional peripheral equipment.

　　For the fourth category of high-power office equipment including thin-and-light laptops and portable monitors, conventional power banks lack sufficient voltage gears and cannot supply power to laptops. Power failure during outdoor mobile office and business trips will seriously affect work progress. This multi-voltage power bank covers exclusive high-voltage power supply gears for laptops, fits original factory power supply parameters of mainstream Windows thin-and-light laptops and entry-level MacBook laptops, and provides stable high-power power supply to cope with emergency power supplement demands during outdoor work and business travel.

　　Different from generic multi-voltage power banks on the market with disordered voltage switching and slow device identification caused by blindly stacked voltage gears, this power bank portable charger multi voltage output adopts an intelligent device identification chip. It requires no manual voltage switching, and can identify device model, rated power and standard voltage instantly once plugged in, matching corresponding output gear accurately within milliseconds to avoid device burnout caused by wrong manual voltage switching. It also supports simultaneous output of multiple ports with independent voltage distribution for each port. It can charge three devices with different voltage demands (mobile phone, mini fan and driving recorder) at the same time without mutual interference, and every device obtains exclusive adaptive voltage.

　　Adopting a lightweight and portable body design, this power bank abandons the bulky volume of professional power adapters and takes both multi-voltage compatibility and portable travel performance into account. There is no need to prepare separate power banks for mobile phones, laptops and vehicle regulated power supplies. One single charger covers all scenarios including daily entertainment, vehicle use, outdoor photography and mobile office. Focusing on differentiated power supply demands of different digital devices, it realizes intelligent adaptive multi-voltage output, perfectly compatible with all kinds of electronic equipment. It helps users get rid of heavy burden of carrying multiple chargers and solves all charging troubles with one device, serving as an essential all-round portable power supply companion for travel.