RED Epic camera shutting down when using Anton Bauer HC-90 batteries with hot-swap connector

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2012Batteries/Power forum

14 years old. Gear and prices may have changed since.

An Anton Bauer hot-swap powering a RED Epic shut down after 20-30 minutes of operation despite batteries showing adequate charge remaining.
Using a single HC-90 battery or a single D-160 battery operated the Epic reliably, suggesting the dual-battery hot-swap configuration triggered the issue.
Anton Bauer hot-swaps designed for Dionic 90 and HyTron 50 batteries may have compatibility issues with HC and HCX batteries, requiring the newer QR-HOTSWAP-AR or QR-HOTSWAP-GM model instead.
Batteries at unequal voltages connected to a hot-swap without proper diode isolation may attempt to charge each other, potentially causing shutdowns or power delivery problems.
The QR-HOTSWAP-AR and QR-HOTSWAP-GM models differ mechanically in mounting points, with the Alexa-compatible version also passing battery information to the viewfinder and featuring a higher amperage breaker.

The exact cause of the shutdowns was never definitively determined in the thread.
The operator had no prior experience with the Epic camera and limited time to troubleshoot during the shoot.
No testing was done to verify whether the issue persisted with matched battery voltages or with the correct hot-swap model for HC batteries.
The camera also required frequent reboots unrelated to battery issues, making it unclear whether power delivery or firmware problems caused the shutdowns.