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Selecting br or cr.pdf

Manganese Dioxide [MnO2] Lithium Batteries (CR type)
Available in 6 different cylindrical configurations and 23 different coin cell sizes, this 3V chemistry is popular because of its
slightly lower cost and broad availability on the retail market so it is typically found in applications where replacement of the
battery is performed by end users. The CR chemistry is preferred for higher current drain, intermittent pulse mode applications
such as alarm actuation in watches or remote keyless entry systems.
Because of the MnO2 content in the cell, CR type batteries have a tapered discharge profile and perform well in comparatively
large current applications. Characteristically, CR type batteries begin with a slightly higher voltage than BR during discharge.
However, as a CR cell discharges, the operating voltage drops over time because of the rise in internal impedance. CR type
batteries are slightly less robust than the BR type when exposed to temperatures at the high end of the operating temperature
range and can experience a rapid increase in self-discharge at the high end of its temperature rating.
Poly-carbon Monoflouride [(CF)n] Lithium Batteries (BR type)
Available in 3 different cylindrical sizes, 2 types of pin cells and 12 coin cell sizes in the standard version plus 5 coin cell sizes in
our special high operating temperature series. This 3V chemistry is ideal for real-time clock and memory backup applications.
BR series batteries exhibit stable voltage over the entire life of the cell and stable performance at comparatively highenvironmental temperatures. The self-discharge of the BR chemistry at elevated temperatures is also superior to other lithiumcoin cell chemistries.
Superior Storability
Because lithium batteries employ substances that are very chemically stable as the active material (BR series: Poly-carbon
Monoflouride; CR series: Manganese Dioxide) it is possible to have more than 90% residual capacity after 10 years of storage*,
more than five times greater than that of conventional batteries. The estimates rate of annual deterioration is around 0.5% for
the cylindrical type BR series and around 1% for the cylindrical type CR series and the coin type BR and CR series*
*(at room temperature)
BR –vs- CR: Comparison Table
Negative Material
Lithium (Li)
Lithium (Li)
Positive Material
Poly-Carbonmonofluoride (CF)n
Manganese Dioxide (MnO2)
Storage Temperature over 60ºC
Good (up to +85ºC)
Not recommended
Cylindrical Type
-40ºC~+85ºC
-40ºC~+70ºC
Operating
Coin Type
-30ºC~+80ºC
-30ºC~+60ºC
Temperature:
High Temperature Coin Type
-40ºC~+125ºC
-30ºC~+80ºC
Current Handling Capability
Excellent
Discharge Voltage Characteristics
Stable to end of battery life
Gradually decreases
Discharge Current Characteristics
Better for Low Drain
Better for High Drain
Typical applications
Real Time Clock, Memory B/U
Pulse Discharge, RFID,
Keyless Entry, Flashes
Discharge Characteristics
BR2032 –v-CR2032 Coin Cells
Toll Free: 877-726-2228 E-mail: oembatteries@panasonic.com

Source: http://bestbyte.net/merchant/pdocs/Selecting%20BR%20or%20CR.pdf

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