There is a lot of good (and some misleading) data on Li-ion batteries on the internet. Most refernces I have seen indicate a Li-ion battery has a max temp range of about 110 -115F. My bike has a LiFeP04 battery which is supposed to have a slightly higher temp limit. Both can be damaged by prolonged use, charging, or storage at high temps, resulting in reduced battery life.

On the cold side, performance will be reduced at lower temps, and they should not be charged when the battery is below about 40F. Optimum operating temp is in the range we humans like: 50 - 70F prox. There is a low temp point at which the battery will just cease to function - it varies by chemical compound. Memory (can't find the reference right now!) says this somewhere below 10F.

From a practical standpoint that creates some rules of thumb on battery care:
Don't leave the battery in an unheated garage/storeroom in cold weather - or in a hot one in the summer.

When storing the battery keep it in an average room temperature at about 50 -60% state of charge. (Most new battery packs are stored and shipped at 50% SOC and should be charged before using.)

Don't overcharge it (causes temp spikes) or run it into deep discharge. Life will be shortened, and a completely depleted Li-ion battery may not come back from that state. (There are stories to say it will be OK, others tell about a destroyed battery. Take your choice about which to believe. I tend to err on the safe side.)

As others have posted, the addiction of an insulated cover and hand warmers will help if the commute is longer.

I use my electric car year-round - 20 below zero to over 100, but unlike the bike battery, the car has an complex battery management system that will heat or cool it to maintain battery health. But even with that system the range will drop 20 - 25% in winter. The battery and temperature control system has enough mass that it will not cold-soak to an inoperative point overnight, but long term exposure will cool it to the point that the system will not allow it to damage itself by powering the car. In that case it will only draw sufficient power to run heaters to bring the battery to a safe point and them allow it to power the car.

With a car, bike, iPhone, iPad, laptop and random other rechargeables it seems like I always have something plugged in! But the power company loves me.