I'm seconding everything lion504 said, so make my post more as addition than opposing viewpoint, I just wanted to mention a few things.
First up is resistance. In addition to capacity, resistance tend to go up as a battery age, and is also a useful health indicator. A lot of chargers will give you a resistance reading, also some none analyzer ones. The quality of these can vary a bit, but it's good to keep an eye on, as it's something you can notice during every day use.
Also, storage voltage matters when storing LiIons for a long time. If they've sed discharged buying a certain level, they can be damaged. Some will try to revive them by bringing the voltage up slowly, others will hand the cells in for recycling if they voltage has stayed below a certain voltage for an extended period of time. How careful you'd want to be depends on personal risk preference and use case. I wouldn't use a battery that's been stored for two years and showing less than 1V for vaping for example, but for outdoor RC-car use I wouldn't mind trying.
Also, while I think it's needlessly expensive for most, there's also the SkyRC MC3000 charger. It gives more control of testing and charging batteries, but it's not something you'd typically need, I'm just mentioning for completeness.