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5.4.2.1 Battery Replacement
1. Remove the electronics chassis from the housing according to the disassembly procedure. Ensure
the battery harness is disconnected from the circuit board (Connector JP5). The batteries are
housed in Delrin battery holders, there are six batteries per holder. Each holder has an Aluminum
cover plate that is held in place by four, #4-40 screws.
2. Sequentially remove the four cover plate screws from each holder and set them aside. The battery
strings are forced together by spring loaded contacts on the holders ends. Pry the middle cells out
then side out the adjacent cells. Dispose of the old batteries in accordance with local regulations.
To prevent contact contamination, each cell and each battery contact must be cleaned just prior to cell
installation. EdgeTech recommends using rubber gloves while changing batteries.
3. Burnishing the contacts. The recommended cleaning procedure calls for first burnishing the
contact areas with a soft pencil eraser.
4. After burnishing, the contact area needs to be wiped clean with a Kim wipe and Isopropyl alcohol
and then Lithium Based Mechanical / Electrical Grease (L260np high drip point) [PN 0012744]
should be applied to battery contact surfaces.
NOTE: After cleaning and applying the grease, do not touch the contact
area or allow it to come in contact with anything.
5. Carefully insert the new, cleaned batteries into the holders. Each battery holder has a label
indicating battery orientation. Ensure the battery alignment matches the label.
6. Install the battery holder cover plate using the previously removed four, #4-40 screws.
7. Once all the battery holders have been loaded with new cells, use a DVM to test each battery
string for continuity.
8. Measure across the back exposed ends of the battery contacts. These contacts are gold plated
and are located on the circuit boards on the ends of the battery holders.
At 20 degrees C, each string of batteries should measure approximately:
• 10.89 volts for the Lithium battery packs
• 4.77 volts for the Alkaline battery packs
NOTE: For Alkaline Battery packs, 4.77 Volts is half of the packs potential,
the two strings are connected in series.
After reassembly, EdgeTech recommends purging the Release with dry Nitrogen, ensuring the batteries
and electronics are operating in a dry, inert atmosphere. Refer to the P
URGING INSTRUCTION.
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