Help! '61 C10 battery won't hold charge

[bigfunsixone]

Just want to say thanks again to all y'all! Ended up heeding the advice and took the battery to my local napa and had a load test. Needed a new battery, bought it, and since then the truck has been a champ. All the advice is seriously appreciated. If I relied on real life connections alone to help me, then this would've been a SNAFU. Lots of carpenter friends, no mechanic friends. I truly appreciate the help. Luckily this was one of the easiest problems to fix. But I am a complete greenhorn who is not mechanically-minded, so I am seriously appreciative.