Medical Definition of anaphylactic. : of, relating to, affected by, or causing anaphylaxis or anaphylactic shock.
Part of the Electronics glossary: Battery life is a measure of battery performance and longevity, which can be quantified in several ways: as run time on a full charge, as estimated by a manufacturer in milliampere hours, or as the number of charge cycles until the end of useful life.
The most harmful is overcharging which should be limited by the cell phone. Therefore that's not something the average person can control. The next most deleterious to a battery is cycles of charging - normal battery life is often considered to be about 1000 full charge/discharge cycles. Limiting the discharge/charge cycle to only halfway will double that number of charge/discharge cycles before the battery is considered bad.