Frequent charging of smartphones does not harm the battery, as modern smartphones are designed with a lithium-ion battery that has an inbuilt mechanism to prevent overcharging. Lithium-ion batteries can be charged at any time, regardless of their current charge level, without causing any harm to the battery.
In fact, it is better to keep your smartphone charged between 40-80% as it can help extend the overall life of the battery. However, if you frequently charge your smartphone using a low-quality or non-compatible charger, it can lead to overheating and cause damage to the battery in the long run.
Regarding the best mobile repair shop in Redlands, California, I suggest doing some research online and checking customer reviews to find a reputable and reliable repair shop in your area.