On 05/24/2016 01:21 PM, Fred McKenzie wrote:

I would expect there to be an isolation diode between the battery and
the AC adapter's power. I can think of three possibilities:

1. The diode is shorted, so power from the AC adapter is ruining the
backup battery.

2. There is a leaky electrolytic capacitor on the battery side of the
diode. Check current draw from the battery with the AC adapter
disconnected.

3. The AC adapter has failed, so the device is being powered entirely
from the battery. Does it work with the battery removed?

Fred

Thanks for the reply. Wrt to 3) the battery provides for retaining the
user-specified configuration (outgoing message, current time/date, etc)
in memory in case of an AC power outage; the unit still requires the AC
adapter to operate with or without a battery installed. Without a
battery (or too low a battery) the unit will reset to its out-of-the-box
defaults following an AC power interruption. Just like a lot of those
bedside LED alarm clocks with battery-backup. Sincerely,

--
J. B. Wood e-mail: