Use of sodium batteries significantly improves safety and durability
Amazon suggested retail price: 18,600 yen
JESIMAIK launched the GK03 jump starter, equipped with a sodium battery, on April 21, 2025. By replacing conventional lithium batteries with sodium batteries, which are heat-resistant and have an extremely low risk of fire or explosion, safety and stability have been significantly improved. Even when stored in a car for long periods of time, there is no risk of spontaneous combustion, making it safe to use.
High discharge rate and wide range of vehicle compatibility for immediate response in emergencies
The GK03 achieves a high discharge ratio of up to 100C, instantly outputting the necessary high current to start a car engine. It is compatible with a wide range of vehicles, including hybrid vehicles with 12V batteries, motorcycles, tractors, motorboats, and agricultural machinery. Its wide operating temperature range of -40°C to 80°C means it can be used safely even in harsh weather.
Reliable design that requires no maintenance and allows for long-term storage
While lithium battery products require charging and discharging every three months, the GK03’s sodium battery does not. It can be stored fully charged for three to four years and can start the engine up to 50 times or more. With a service life of more than 10 years, it is a reliable design that can be used immediately when needed.
Fast charging and multifunctionality make it great for outdoor use
The sodium battery boasts a charging speed approximately five times faster than standard lithium iron phosphate batteries, fully charging in just 1 hour and 15 minutes and reaching 99% charge in 1 hour. The 88Wh/27500mAh/3.2V high-capacity battery can simultaneously power multiple devices. It also features an LED light with three modes: steady, SOS, and strobe, making it ideal for outdoor lighting, including indoor and outdoor night work, night fishing, and camping. The front LCD display allows you to check the remaining battery level and voltage at a glance, and the smart cable with multiple safety protection features and voltage display prevents risks such as overvoltage, overheating, and reverse connection, significantly improving safety.
JESIMAIK’s jump starter “GK03” uses an innovative sodium battery, making it a safe, durable, and convenient product that is expected to be useful in a variety of situations, such as recharging a dead car battery or securing power outdoors. It can be purchased from the official website or online stores such as Amazon, Rakuten, and Yahoo! Shopping.
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