The battery should last for 5 to 10 years, but it is probably a good idea to replace it with a fresh battery every 5 years or so. The backup battery is a single standard CR2032-style lithium 3V coin cell. To open the case there are 3 torx head screws. One in the bottom center (T10 size) and two at the back plastic feet (T20 size).

Thank you, Please visit ERM's web site: http://www.erm.com

For additional information, please visit the LYRASIS website or contact me.

The Meridian is built to mil specs but would be hard to find a replacement outside of Seattle. The Rolls can be air shipped dry if a unit is needed. I probably could find a 8D at a larger town in Canada where fishing boats visit. Golf carts seem to be readily available. I definitely want a long term life, reliability, and the high amperage when I need it.

For sale: One new PRS-10 which has been in storage in original anti-staric bag for a couple of years. Bag has never been opened. Basic PRS-10, no options. Asking $800 + shipping to CONUS address. Please reply off list. -Brian

. > > Can one use a common non-rechargeable coin-cell battery like a CR2032 to > provide this backup power, or does it need to be a rechargeable battery? > Will a CR2032 or the Oncore itself be damaged if such a cell is used? > > 3.

So if your ESE ES-911 loses input power, 6V backup battery power, and the GPS coin cell drains then you will need to fix the battery problems and then manually re-initialize the GPS receiver in order to get the device working again!

But of course a regular silicon diode like 1N4148WS will work as well, at the expense of wasting some of the energy of the coin cell. > Nice design you have created.

Visit www.audubonct.org for environmental policy and bird conservation updates.

How could such a person "figure out the >EFC voltage needed"  with out either coining cycles? > > >I'm thinking about turning the overflow counter off after lock.