Can you bring Non-Spillable Wet Batteries on a plane?
Coop checked the book. Here's the ruling for Non-Spillable Wet Batteries:
What the TSA says
The information in this entry is limited to non-spillable batteries with absorbed electrolyte (gel cell, absorbed glass mat, etc.) used in portable electronic devices. It does not cover large vehicle batteries. For battery-powered wheelchairs and mobility devices, see separate entry. The battery voltage must not exceed 12 volts and the battery watt hour rating must not exceed 100 watt hours. Battery-powered equipment must be protected against accidental activation and the evolution of heat, and damage to the terminal posts. See FAA regulations for full packaging requirements. No more than two spare (not installed in device/equipment) batteries may be carried.
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Based on official TSA guidance. The final decision rests with the TSA officer at the checkpoint.