According to ifixit, at least some of the 2012 models are rated as "easy" battery replacement. This will probably mean that aftermarket products will be available. That said, it's hard to know whether age or usage will kill your battery. But that's a relatively low cycle count. If it will go a few hours on a charge, that's probably a good indication it's in good shape.
- I see Safari using lots of energy. Try to see if it's an offending site that's using CPU/energy. Activity Monitor can help. I use something called Turbo Boost Switcher to turn off turbo boost, which, for whatever reason, seems to help battery life while casually web surfing...
Later models (such as my late 2013 15-MBP - much harder. I've made a note to get Apple to replace the battery next year.