Hi Lee, My old battery died after leaving the charger plugged in 24/7. I bought a new battery, and it died in less than 2 months (after being=20 left with the charger connected). These decommissioned phones work great for extension telephones for my=20 wifi based internet phone system. But, in order to be always ready in=20 case I get a call, they need to be left connected to the charger 24/7. I suppose I might add a timer that completely takes power away from the=20 charging input in order to keep the battery at 50 percent charged. This=20 would avoid the trickle state, which does seem to destroy the battery if=20 left connected to the charger all the time. I was hoping for a better solution..... Are these smart charging chips user programmable so I can change the=20 parameters (like reducing the trickle charge to a few microamps after 50=20 percent charge is achieved)? A fifty percent battery charge will run my=20 phone for 3 hours of talk time, which is satisfactory for my purposes. These cellphones have no cell service, they are used to provide a wifi=20 link between the phone and the router, running special software in the=20 phone so that it will function without a cell service contract. TY. Art >if it stays at a trickle state then yeah it >probably will slowly kill a battery if kept connected. On 07/08/2015 12:58 AM, Lee Mulvogue wrote: > if it stays at a trickle state then yeah it > probably will slowly kill a battery if kept connected. --=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 .