Fatshark DIY battery holder
thingiverse
Simple holder for two 18650 batteries. Cutouts are for charge lead, balance port and optional cables for voltage monitor. Wiring diagram can be found here: https://www.rcgroups.com/forums/showthread.php?2638071-FatShark-Li-Ion-Battery-Upgrade Lid is meant to be glued after battery is inserted. I charge them through the charge lead, so no need to remove them from the case.
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