Can I charge 2 AA batteries on one side and 2 AAA batteries on the other side at the same time?

Yes you can if your charger has at least 2 individual charge channels... independent charging circuits which will allow you to charge 2 AAA batteries in one side and 2 AA in the other.  The two cells on each side need to be a matched pair of the same size and capacity. The charger has 4 independent charging circuits so you can charge any combination of batteries regardless of type size or capacity. ...

Will "fast charging" my batteries reduce their life cycle?

Yes, the maximum number of charge cycles that your rechargeable batteries can endure will be somewhat less using fast chargers vs. slow overnight chargers. The cycle life attained is dependent on many factors including the rate of charging and discharging as well as the depth of discharge between charge cycles. In other words if you want to attain the highest number of charge cycles use a slow charger and begin recharging your cells before they are 50% discharged. You would be however, sacrifici ...

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