On Tue, Jul 25, 2017 at 7:18 AM, Jim Toth <jt...@localnet.com> wrote: > Can an M100's backup battery read 4 volts and still be too bad to work > right? I've seen car batteries act that way.
you have to measure it during standby. With the power off and the standby power on, measure the battery voltage (and double check that the same voltage is present on the RAM's power pins. If the battery voltage is around 3.3V in this situation, then it's good, if it drops to 2.6V (even 2.8) or less, then either there's too much current consumption from the RAMs and RTC or the battery needs to be replaced (assuming it has seen enough charge time since the last power off). HTH Frank IZ8DWF
