A thought for anyone with a bait boat. With the current temperatures below zero, snow on the ground and all my local lakes shut due to being frozen, bring the battery and handset inside the house - mine lives in my shed attached to the garage. Batteries hate being cold, especially for prolonged periods and they can completely discharge in these conditions and it can render them near useless. Bring them inside and fully charge them and they should be OK.
Also going to disconnect the battery from my electric bike and bring it inside and charge it up, I won't be riding it anytime soon until the weather significantly changes.
Some people also keep camera's in their fishing bags and the cold apart from killing the batteries they also may suffer from internal condensation. I keep my fragile stuff like the camera, spare batteries, binocular's and power pack in a separate small bag and always bring it in the house after a trip.