Define your needs
First and foremost, you must define your needs. Are you constantly on the go and prefer something small? Do you require speedy battery recharge? Or do you need to recharge a big number of batteries?
With that precise purpose in mind, there are numerous eneloop chargers that may be suitable for you. Some are designed to reduce charging times, which is useful if you require freshly charged batteries right away.
Others keep a predetermined charge time, ensuring that all of your batteries are completely charged and ready to use. A professional charger is the way to go if you really want to maximise battery life.
Decide whether you need a compact charger or whether you really need to go for a professional charger.
A wide range of chargers
If you only need a simple charger, the eneloop BQ CC50 will suffice. You can charge two AA/AAA cells with this. It features a built-in timer cut, which means it will stop charging after 13 hours. The BQ CC51, a larger variant that can accommodate two or four AA/AAA cells, is the same.
But, if you use batteries frequently, the BQ CC55 Smart & Fast charger is preferable. Instead of charging two or four cells, this one lets you charge one to four batteries separately. The built-in smart charge feature prevents the battery charger from charging any particular battery when it is full. You won't have to worry about overcharging this way.
If you want something in the middle, the BQ CC17 Advanced charger will suffice. According to Amazon reviews, it is the best quality charger for the money. It takes 7 hours to charge four ordinary eneloop AA batteries. Do you consider yourself a heavy user of batteries? Then the BQ CC63 is your best friend. It allows you to charge up to eight batteries at once.