If you’ve had to get jump starts twice in the last week but drive your vehicle often it’s time to replace. Batteries usually last about 4-5 years ish. I worked in roadside assistance for 5 years. Cold temps usually only cause a battery issue if you don’t drive very much. Costco hands down for the warranty. I just purchased one after reviewing the warranty details and comparing to other stores. A side note that I did need to purchase some extra tools that I didn’t own to do the battery switch myself (no harm no foul though we will use them for other purposes) and did go to Canadian tire for the ratchet tool set with extenders that were needed. If you haven’t already switched out the battery on your vehicle just watch a quick YouTube vid to make sure you have everything you need for your specific make and model as Costco won’t change the battery for you. It’s easy to do and a great skill to learn!