- PURPOSE / DESCRIPTION
To validate the performance of a battery under representative conditions.
- TEST SET-UP
2.1 Re-create test set up as seen in figure 1.
2.1.1 Battery for testing
2.1.2 Battery connectors (XT60, or JST depending on battery size)
2.1.3 DC Electronic Load instrument
2.1.5 IR Thermometer
2.2 Determine the power discharge rating of the battery using the following equation. p=3.7*s*c*a
P is the power discharge rating in watts, s is the number of cells wired in series in the battery, c is the c rating of the battery, and a is the capacity of the battery in amp-hours.
2.3 Calculate 50%, 75%, and 100% of the power discharge rating, the battery will be tested at each of these discharge
Figure 1: Test Assembly
3.1 Place a non-flammable covering over the battery (in case the battery fails)
3.2 Turn the DC load instrument on, and press P-set and enter the power calculated previously
3.3 Press on/off on the load, and start timing.
3.4 Record the voltage displayed on the load cell every 20 seconds, and use the IR thermometer to read the temperature of the battery every 60 seconds
3.5When the battery voltage as read by the load device reaches 9.00V stop the load by pressing the on/off button. Record the time from the stopwatch, and use the IR thermometer to measure the surface of the battery.
3.6 Unplug battery being tested
3.7 Inspect battery for excessive puffing or heat
3.8 Begin steps 3.1-3.7 for all discharge rates being tested.
3.9 Record time data and temperature.
3.10 Find the average voltage over the test.
3.11 Use the equation C=p*t/3600 to find the total energy expended in Watt-hours.
3.12 Divide this by the average voltage to find Amp-hours, and then multiply by 1000 to find mAh.
4. ACCEPTANCE CRITERIA
4.1 Battery should not exceedingly puff up.
4.2 The surface temperature of the battery should not exceed 120 degrees F.
4.3 The value C should be used to compare batteries under the same loading conditions.
Engineering Test Results