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Description from the supplier

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DC DC 2V-5V to 5V 2A Step Up Boost Lion Battery Power Supply Module Lithium Voltage Converter Board

https://www.aliexpress.com/item/2pc-DC-DC-Step-Up-Boost-Power-Supply-Module-2V-5V-to-5V-2A-Fixed-Output/32657958081.html?spm=a2g0s.9042311.0.0.VQXoGv

  1. Input voltage:2.0V-5.0V
  2. Output voltage:5V
  3. Output current:2A(max)
  4. PCB size:7*13mm
  5. SMD
  6. Conversion efficiency:95%
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Own experience

Used for boosting 3 coin cells of a "Sound Machine". Result: the batteries last much shorter...

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