A survey reveals Japanese consumers now favour safety as the main factor in mobile battery purchases, prompting Motteru to introduce semi-solid battery technology designed to reduce fire risks from September 2026.
MOTTERU says Japanese consumers are shifting away from capacity as the main criterion for buying a mobile battery, with safety now the dominant concern. In a survey of 500 men and women aged 20 to 69, conducted online on 30 July, 38.6% said safety mattered most, compared with 15.4% who chose capacity. The company also found that 39.0% worry about fire or overheating when using portable chargers.
The findings point to a market increasingly shaped by incidents and perceived risk. MOTTERU said 40.2% of respondents had at some point felt danger or unease while using a mobile battery, and 88.6% were aware of fire-related accidents. Even so, there is still a gap between concern and action: while 79.6% expect manufacturers to prioritise safety, only 20.8% said they always check for the PSE mark, Japan’s safety certification for electrical products.
Price appears to be less of a barrier when safety is clearer. MOTTERU said 56.6% of respondents would pay more than ¥500 extra for a safer product. Awareness of semi-solid batteries remains limited at 30.6%, but once the technology was explained, 57.8% said it would be a purchase candidate or something they would actively want to buy.
That backdrop frames MOTTERU’s plan to roll out a new mobile battery line using semi-solid battery technology from September 2026. The company says the material changes the electrolyte into a clay-like state, which it presents as a way to reduce fire risk. The range will come with a two-year warranty and will be offered in three capacities: a 5,000mAh model priced at ¥4,970, a 10,000mAh model at ¥6,640, and a 20,000mAh version at ¥11,080.
According to MOTTERU’s product announcement, the 5,000mAh unit weighs about 106g and supports USB-C PD output of up to 20W, while the 10,000mAh model weighs around 182g and is offered in five colours. The 20,000mAh version is rated at up to 45W output and weighs about 329g, which the company positions for travel, business trips and emergency use. MOTTERU says the larger model is intended to handle smartphones, tablets and even laptops, and that its semi-solid batteries are designed for stronger durability in higher and lower temperatures than conventional lithium-ion designs.
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