“HarvestLoop™” Solar-Powered Energy Harvesting Coin battery

Integrated Energy Harvesting Module

Recipient of the CES 2025 Innovation Award, SMK HarvestLoop™ is the world’s first solar-powered, energy harvesting coin battery with integrated multiple sensors and Bluetooth® Low Energy wireless communication.

Designed in a CR2032 size form factor, it reduces the reliance on lithium batteries and electronic waste, while promoting sustainable energy initiatives.

Applications:

  • Remote controls
  • Sensors
  • Measuring Instruments
  • Bicycle Components
  • Etc.

Features

  • CR2032-compatible coin battery module
  • Charging by solar power generation
  • Equipped with communication function by Bluetooth® Low Energy 5.3
  • Integrated PV cell
  • Replaceable PV cell (single- or multi-cell)
  • Internal sensors (acceleration, temperature and humidity, as well as magnetic)
  • Also supports wireless power transfer over the air (requires separate external antenna)
  • Supports SMT

Specifications

Energy Harvesting
PV Cell Φ16mm (Active Area), 4 Cells
Solar Harvest Current [Vop 2.5V] 5uA@200Lux, 100uA@5000Lux
RF Harvest Frequency* 400MHz to 2500MHz
RF Harvest Input @918MHz* -18 to 10 dBm
RF Harvest Input @2450MHz* -15 to 10 dBm
  • *

    RF harvest requires an external antenna.

General
Size Φ20mm×3.2mm(Compatible w/ CR2032)
Weight TBD
Battery Capacity (ET1210C-H) 4mAh
Output Voltage 3.0V±2%
Discharge Current (Max) 15mA
Operating Temperature Range -20 to 60°C
Sensors
3-axis Acceleration Sensor
  • 16bit Digital
  • Acceleration Ranges:±2g/4g/8g/16g
Temp. Sensor

Temperature Range : -40 to 85C

Temperature Accuracy: ±0.2°C
Hall Effect Sensor Magnetic Threshold:9.5mT, Omni-polar
Wireless Communication
Bluetooth® Low Energy 5.3
  • Tx @0dBm: 3.0mA
  • Rx @-95dBm: 1.4mA
Range Approx. 10m

Inquiries

Please feel free to contact us for product information and customization