An I have another phone with an annoying "feature". If left on the charger it fully charges the battery, then stops charging and runs the battery down. It will only recharge if the charger is disconnected and then reconnected again. I wanted to use it as a webcam but..... For best battery life it should be charged to about 4V/cell. This corresponds to about 70% charge. Above this voltage the anode degrades. Below this voltage and the cathode degrades (so I'm told). If you have control of the inner workings of the charger you could try resetting the voltage to ~4V/cell (4V ?) and just leave it plugged in. RP On 30 May 2018 at 09:08, James Cameron wrote: > In my experience it depends on the phone DC input, usually under > firmware control. > > Measure current over time on the DC input to document behaviour. > > Some phones reach charged state and disconnect the DC input, then draw > almost no current until either battery voltage falls, or estimated > state of charge falls below something like 90% or 95%, then they > reconnect until charged. > > Some phones reach charged state and disconnect the battery, operating > from the DC input until the DC input is removed. Of these, some won't > track estimated state of charge during the self-discharge phase, and > some will. > > One device I have goes one step further; if you leave it connected for > a week, it presumes you plan to leave it connected forever, and says > so; it disconnects the DC input until estimated state of charge > reaches 50%, then transfers the load to the DC input. > > Thus it entirely defeats the idea of keeping the device _ready_ for > use on battery in this way. > > -- > James Cameron > http://quozl.netrek.org/ > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .