For reels:
Moisture that enters the reel can freeze and expand, potentially damaging the internal components.
For rods:
Graphite and carbon fiber rods can become more brittle in freezing temperatures, increasing the risk of breakage.
Rod guides may accumulate ice, which can harm both the guides and your line.
Metal components can slightly contract in extreme cold, posing a risk of guide rings popping out.
Significant fluctuations in temperature can affect the integrity of rod blanks over time.
Replied on At the risk of asking a dumb question...
21 Jan 22:25
In the northern regions, I bring my batteries inside whenever possible. If that's not an option, I keep the Lead/Acid/AGM on the charger. I leave the lithium batteries at a 50-80% charge for long-term storage.