battery or alternator

Good day everyone. I bought the truck brand new in 2016. Took it into service every 6 months for the first two years, charging system checked out fine. Then once more for the 3rd year, charging system checked out fine. Using Costco Interstate batteries. Started using a 1.8 watt solar trickle...

Well i have to say i drive the truck once a week avg.... Maybe twice a month even. This cold weather and that combined have given me some sluggish starts lately. Im not going out to check the age of my battery right now, but i dont think its more than 3yrs old. Once i have driven for about...