CR Battery Chemistrywhats the difference between CR and BR ?
CR denotes Lithium Manganese Dioxide (LiMn02). These kinds of batteries are often used in cameras because of their high energy density and ability to perform in low-temperature environments. CR batteries are also used in smoke alarms and security applications. Anything that requires a small high-powered battery probably uses Lithium Manganese Dioxide chemistry.
CR Batteries:
- Provide a high density charge in a small package
- Work well in digital cameras and computer peripherals
- Can handle low temperatures relatively well
- Discharge quickly and evenly (for a camera flash)
- Have a great shelf life
BR Battery Chemistry
BR denotes Lithium/Carbon Monofluoride Li-(CF)x. Batteries with this kind of chemistry are well known for their superior shelf life. BR batteries often last 7 years on the shelf. They have one of the slowest self-discharge rates of any battery on the market. That’s why they are commonly used in clocks, pacemakers, and not surprisingly, long range missiles.
BR Batteries:
- Last up to 7 years on the shelf
- Have been used in space applications since 1976
- Can be found in pacemakers
- Function up to 85 degrees Celsius
- Usually discharge less than 0.5% each year
from: http://www.cr2032.co/chemistry-article.html
The 71,700 Backup Battery goes for $120, and can be order by calling 503-263-0037How much does a new one cost?
We use silicone to adhere the battery but this comes attached to the battery.What do you use to glue it to the back of the cover?
The internal backup battery should be able to power your EFIS for over half an hour. The easiest test is to enter calibration, SELECT into Airspeed, and change your Airspeed Adjust to 50 kts. This will keep the EFIS from powering down. SAVE and RETURN to EFIS mode. At this point turn off your master and start a timer to see if the EFIS can remain for over 30 minutes. Be sure to return the Airspeed Adjust back to its original settings after this test.How long should it keep the EFIS functioning?
I would recommend about every 5 years replacing both backup batteries.
There is a small battery in the lower left of the EFIS. That has 4 bars showing charge.and what voltage is indicated when powering the EFIS?