How about the energy-based body fat scale?

Photovoltaic body fat scales, also known as photovoltaic body fat meters, are intelligent body fat scales that utilize photovoltaic charging technology to measure various physical indicators including body fat. Here is the relevant introduction:

Working principle:
The photovoltaic body fat scale is equipped with photovoltaic panels on the surface or bottom of the scale. For example, the surface of the Lefu Solar Energy Body Fat Scale has a highly sensitive polycrystalline silicon photovoltaic panel. These photovoltaic panels can convert sunlight, artificial light, indoor natural light, etc. into electrical energy to power the body fat scale. At the same time, it adopts dual-frequency BIA (Bioelectrical Impedance Analysis) technology. By passing a microcurrent through human tissues, it accurately calculates body fat percentage, muscle mass, basal metabolic rate and other body indicators based on the impedance of the current.

Main features:
1)Solar charging, long-lasting battery life: The photovoltaic body fat scale does not require frequent battery replacements or the use of charging cables. For example, the Lefu Solar Body Fat Scale, even in a dark environment without light, can weigh once a day for 15 seconds. The built-in high-capacity storage battery can last for 4 years, and weighing once every two days can support a battery life of 8 years.
2)Accurate measurement, comprehensive data: Some high-end products have a weighing accuracy of up to 50g, which can precisely capture the subtle changes in human weight. They can also provide 49 body data items, covering body fat percentage, visceral fat grade, muscle mass, protein rate, etc., allowing users to fully understand their own health status.
3)Intelligent linkage, convenient management: It supports Bluetooth connection and can synchronize data with the mobile phone APP. For example, the Lefu Solar Body Fat Scale can be linked with the "Calorie Weight Loss Method" APP to generate in-depth health reports and personalized diet and exercise plans; the LEFU Lefu Solar Body Fat Scale (model: LFB-800) can be synchronized with the "Lefu Health" APP to generate monthly trend charts and also set target reminders.

Representative product:
Unique Solar Body Fat Scale: Produced by Shenzhen Unique Scales Co., Ltd., this company is one of the first domestic manufacturers to obtain the national high-tech enterprise certification. The Unique Solar Body Fat Scale performs well on e-commerce platforms and has repeatedly topped the "Best-selling Body Fat Scales on Douyin" and other lists. In 2025, it reached a strategic partnership with Walmart and its products entered the Walmart supermarket market in the United States.

Unique Scales Photovoltaic Body Fat Scale (Model: CF820BLE): Produced by Shenzhen Unique Scales Co., Ltd.,It ranks as the 5th best-selling product of smart body weight and body fat scales on Alibaba. It features solar charging and Bluetooth connection functions. The maximum load capacity is 180kg. It is made of ABS + tempered glass materials.