Optimus Range - Internal Cell Replacement for Real Time Clock (RTC); Replacing the Lithium Cell

INTERNAL CELL REPLACEMENT FOR REAL TIME CLOCK
(RTC)
The Intercom Unit is tted with 3V Lithium cell CR1220, which provides backup to preserve Time and Date within the RTC
during power down.
The 3 Volt Lithium cell CR1220 is mounted on the 4G PRO in a holder, this allows the cell to be changed, if/when needed.
For reference, the RTC has an accuracy of +/- 1.5mins per year.
The life of the cell is approximately 1 year if the 4G PRO Board is left un-powered.
A continuously powered up 4G PRO would allow the cell to achieve a shelf life of 10 years min.
REPLACING THE LITHIUM CELL
CAUTION: RISK OF EXPLOSION IF THE CELL IS REPLACED BY AN INCORRECT TYPE. THE CORRECT TYPE IS LITHIUM
CELL CR1220.
To Replace the Cell:
1. Replacing the cell is necessary when it is close to exhaustion, which can be identied when the Cell voltage
reaches 2.7V, measured with a digital meter across the legs of the holder.
To Change the Cell:
2. Keeping the board powered will not lose any date/time settings.
3. If the cell is exhausted and Date / Time are wrong, there is no need to power up the board prior to
replacing the cell.
4. Check and / or reset the date / time through SMS Short Command Programming Guide.
Method:
1. Press the side of the cell through the slot in the holder with a slight upward bias using a small at bladed
screwdriver or the edge of an old sim card, the cell will pop out. Do not lever the cell out.
2. Slide the new cell into the holder.
3. On the old cell there is a yellow sticker, remove this and t over the new cell and holder.
4. Do not put the yellow sticker on the new cell rst as it may not make proper contact with the holder.
5. The yellow sticker is there to protect the top of the cell which is the positive terminal and minimises the
risk of any metallic objects touching it.
Please dispose of or recycle the exhausted cell in a responsible way and according to the Cell manufacturer’s
instructions.
If storing un-powered 4G PRO boards for an extended time, Optimus recommends that the cell is removed until the
board is needed.
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NSTALLATION MANUAL FOR OPTIMUS 4G LTE RANGE OF INTERCOM UNITS