The Ikki68 Aurora Wireless board (Tromso/Iceland PCB), Mammoth75, and Zoom65 all have the same space for a 3.7v battery with a max dimension of 43x114x3.5mm (Model number 3543114)
The Mammoth20 fits a 3.7v battery with a max dimension of 50x34x3mm (Model Number 303450)
If you are purchasing from eBay or other international stores, you might need to solder a JST connector (1.25PH 2-pin). Alternatively, you can request a connector be attached prior to shipping.
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