BATTERY DISSCHARGE QUIKLY WHEN PLUGE STARTE OLD IPHONE

Battery life is 18 month 2 year max usage if you charge and dis charge every 2 months and leave it for 2 days in a coma it may revitalize the battery the problem with batteries is the constant heat from your body, recharging usages heat from the CPU all these conditions Zap the chemical reaction that changes ,also recharging and dis - charging using weakens the battery, magnetc fields and wifi also change the senses of the electrionics inside and give you an incorrect reading ,but most of all wifi search uses power in the back ground