[amatecha]

Yeah, I have a 2013 MBP as well, and it has been problem-free. The battery still lasts hours! I think it's because I almost always used it plugged-in, so the battery has a very very low cycle count. I am SUPER impressed with how well the machine has lasted, considering my heavy usage of it!

[avitous]

I, too, have a late 2013 MBP, and just today replaced the battery a second time due to swelling; first time was mid-2018. I also leave my MBP plugged into power all the time, and rarely use it as a laptop apart from my desk, and suspect this may be contributing to lowered battery lifetime. However, 4.5+ years on the factory installed one, and 3 years on the first replacement seemed OK, given the machine has given me no other issues at all in the 8 years I've had it. Both battery repairs were done myself using the excellent iFixit replacement kit and instructions. While I know I have to replace this MBP eventually I'd rather wait until the post-M1 availability shakes out, and I feel confident a replacement MBP won't have the issues that have plagued each years' models from 2015 onward.