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Yes, when charging rechargeable batteries, they do increase in temperature substantially due to internal resistance. The batteries may feel warm/hot when the charge is completed. It is normal. Do not worry.
All of our battery chargers are automatic. Follow the charging instructions that came with your charger. The charger with LED lights the red light on indicates charging in progress and the green light on indicates charging completed.
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.