In 2007, the first iPhone released by Apple disrupted the charger market of the embedded battery era. The introduction of non-removable batteries directly led to intense competition in the charger industry. If the previous competition in the mobile charging market revolved around batteries, the era of non-removable batteries brought chargers into the realm of competition. Apple's iPhone utilized a 5V1A detachable direct charger. In the same year, many countries implemented policies to standardize charger specifications, making chargers with detachable heads and cables the mainstream in the market.

Also in 2007, during the International Telecommunication Union Telecommunication Standardization Sector's (ITU-T) fifth study group (SG5) plenary meeting in Geneva, Switzerland, the adoption of Micro USB as the standard for mobile phone chargers was approved. This effectively meant a global standardization of mobile phone charger interfaces.

In 2010, USB Implementers Forum (USB IF) officially promulgated the USB Battery Charging (BC) 1.2 protocol. This was a milestone as it allowed the charging current to reach 1.5A, achieving a charging power of 7.5W.

In 2011, with the release of the Samsung Galaxy Note, a groundbreaking change occurred in the included charger. For the first time, the output voltage was set at 5.3V, deviating from the conventional 5V output voltage. Many users soon noticed that the charging speed of the Samsung Galaxy Note was much faster than other phones using 5V chargers. From that point on, the concept of "fast charging" emerged.

Subsequently, various mobile phone manufacturers entered the market with their own fast chargers. They often adopted the USB-IF-established Power Delivery (PD) protocol standards, or Qualcomm's Quick Charge (QC) protocol. Additionally, many companies developed their own fast charging protocols, such as Huawei's FCP/SCP protocol, Samsung's AFC protocol, and OPPO's VOOC/SuperVOOC protocol, among others.

Wireless charging technology can be traced back to 1978 when George Berkley, an American, set the precedent for wirelessly charging electric vehicles. In 1994, the Japanese company Murata Manufacturing announced the achievement of "magnetic coupling resonance." In 2006, the Massachusetts Institute of Technology (MIT) in the United States successfully conducted a 2-meter transmission experiment.

At the current stage, there are four main mature wireless charging technologies: electromagnetic induction, electromagnetic resonance, electric field coupling, and radio wave methods. Two widely recognized technologies for products like smartphones are electromagnetic induction and electromagnetic resonance. Around these technologies, three wireless charging alliance associations have formed: Qi, A4WPP, and PMA. Currently, the most widely used protocol in the communication field is Qi. This protocol uses electromagnetic induction technology to achieve wireless charging, supporting low-power and medium-power device charging, and is widely used in smartphones, smartwatches, and other devices.

Wireless charging has both distinct advantages and disadvantages, leading to opposing evaluations in the market. Disadvantages include slow charging speed, low conversion efficiency, and significant heat generation. However, the convenience of wireless charging is considered a significant advantage. Especially in my view, this one advantage is sufficient, particularly when traveling with a wireless charging-compatible power bank. With wireless charging, there's no need to deal with additional messy cables – simply placing the phone in contact with the power bank's induction coil initiates charging.

SHARGE has unique innovations in wireless charging technology. To address the issue of low conversion efficiency due to heating, SHARGE has equipped the wireless charging power bank ICEMAG with an active cooling fan.

With the continuous advancement of technology, chargers are undergoing a new round of transformation, and the new semiconductor material Gallium Nitride (GaN) has begun to be applied to chargers. GaN has strong thermal conductivity, high-temperature resistance, and allows chargers to be made smaller. While increasing charging speed, it doesn't easily overheat, ensuring good safety performance. GaN chargers, whether single or multiple ports, are well-received in the market.

Chargers using GaN technology and the USB PD3.1 standard can achieve a maximum power output of up to 240W. At this point, chargers are no longer limited to charging phones; GaN chargers can also be applied in high-performance discrete graphics gaming laptops, Power over Ethernet (POE) in the security field, electric bikes, IoT devices, and other areas.

The SHARGE 140W charger adopts the PD3.1 standard and GaN technology, supporting a maximum output of 140W. Compared to traditional chargers, it is significantly smaller while maintaining stable performance.

The SHARGE Retro 35 and Retro 67, two portable chargers with a Macintosh-inspired design, utilize GaN technology. They achieve an optimal balance between size and output power, incorporating creative features such as illuminated screens, making them the best choices for daily use.