B&B Electronics Celeron M Universal Network Controller with PC/104 Extension UNO-2170 - Manual (Page 21)

2.10 Battery Backup SRAM
UNO-2170 provides 512 KB of battery backed SRAM. This ensures that
you have a safe place to store critical data. You can now write software
applications without being concerned that system crashes will erase criti-
cal data from the memory.
There is a BTRY LED in the front panel of the UNO-2170, please replace
the lithium battery with a new one if the BTRY LED is activated.
2.10.1 Lithium Battery Specification
Type: BR2032 (Using CR2032 is NOT recommended)
Output voltage: 3 V
DC
Location: the backside of UNO-2170 board.
Figure 2.5: The location of the lithium battery for SRAM
2.11 Reset Button
Press the "Reset" button to activate the reset function. (SW1)
15 Chapter 2