Avtron Model T477W Bonding Meter
with B14703 Battery Pack Replacement Instructions
Part Number T477WC15292
- Battery Testing
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7-1
7 APPENDIX - BATTERY TESTING
Figure 7-1. Battery Test Schematic
7.1 BATTERY TESTING
1. Recharge the battery pack overnight to assure full charge. Battery may remain on the circuit board with the meter
display off.
2. Open the case to gain access to battery pack leads as described in steps 1 and 2 in the B14703 Battery Replacement
Instructions (at the end of this manual).
3. Connect 22 ohm, 2 watt, 10% tolerance resistors between terminals 1 and 2 and between terminals 3 and 4. Record the
time at which those connections were made. Measure the voltage across the resistors. It should be 4.0 volt + or - 0.2
volts. Leave the resistors connected.
4. Periodically (every 5 minutes or less) measure the voltage across the resistors. When the voltage reaches 3.7 volts, note
the time and disconnect the load resistor.
5. Calculate the discharge time, the difference between the time of attaching the load resistor and the time at which the
battery voltage reached 3.7 volts. If discharge time is less than 20 minutes (50% capacity), either replace the battery
pack or attempt to recycle the battery per step 7.
6. If the battery pack is within test limits, recharge the battery and return it to service.
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