Lithium-Ion Battery Requirements

18650 lithium-ion batteries can vary in size and safety features. It is vital that you choose batteries that are safe and compatible with the Song Meter Mini 2's battery tray.

The redesigned lithium-ion battery compartment in the Song Meter Mini 2 can fit a slightly broader range of lithium-ion batteries than the optional lithium-ion lid accessory for the first-generation Song Meter Mini and Song Meter Mini Bat. Wildlife Acoustics sells high-quality 18650 batteries that are compatible with the first-generation Song Meter Mini and new Song Meter Mini 2 models.

If you do purchase lithium-ion batteries from another source, ensure that they meet the following requirements:

• The batteries must be specified as 18650 lithium-ion batteries.

  “18650” describes the dimensions of the battery. Larger or smaller lithium-ion batteries will not fit in the battery tray.

• Use protected batteries only.

  Protected batteries have built-in circuitry that prevents the batteries from over-charging or over-discharging.

  Warning:

  Unprotected lithium-ion cells lack protective circuitry, and they are at greater risk of suffering permanent damage or even igniting.

• Use "button-top" batteries, not "flat-top" batteries.

  The vast majority of protected 18650 batteries are sold as “button-top,” meaning the positive contact protrudes from one end of the battery. "Flat-top" batteries without a button may not make full contact with the battery tray.

• The batteries must be between 67.0 and 70.5 mm in length, button included.

  The protection circuit can vary in size across brands, but most protected batteries sold by reputable suppliers fall within this range.

  Note that the Lithium Lid accessory for the first-generation Song Meter Mini has a narrower acceptable size range.