How to Recondition Rechargeable Batteries

Reconditioning a rechargeable battery is basically just taking it through a deep discharge cycle. The simplest way to do this is just to use the device until it shuts off or doesn’t operate any longer. For a power tool, it should be run without putting a load on it at the end of the discharge cycle. Then just charge it up completely again.

This is simply the deep discharge cycle that was described earlier in the section on “Proper TLC for Your Rechargeable Batteries”. This process can be repeated up to two more times if necessary. If the battery hasn’t come back to good condition after that, you may try rejuvenating it. If that doesn’t help, the battery is no good.

In addition to simply taking the battery through a deep discharge cycle, there are two ways of reconditioning a battery in a more controlled way. The easiest is using a CBA III. The other way is a bit more complicated, but it is a process that I’m sure you can handle. The CBA III process will be discussed first, then the other way.

Reconditioning with a CBA III Battery Analyzer: Here are the steps for battery reconditioning with a CBA III:

1. The battery should be discharged to about 90% of its nominal voltage. That would be about 1 volt per cell for NiMH or NiCd batteries. If you have just finished testing the battery, it will be at the right voltage, because the test procedure takes it down to 90% of its nominal voltage. If you haven’t just tested the battery, the easiest way to bring it down to the right voltage would be to test it, as just described in the last section.

2. After completing the testing, all of the information about battery type, voltage, etc should already be entered in the proper places on the computer screen. You just need to change the entries for “Test Amps” and “Test Cutoff Voltage”.

3. The “Test Amps” should be set between 1/10 and 1/20 of the rated battery capacity in Amp-hours. For example: if the capacity listed on the battery is 1200 mAh, then divide by 1000 to get 1.2 Amphours. 1/10 of 1.2 = 0.12 and 1/20 of 1.2 = 0.06, so the Test Amps should be set somewhere between 0.06 and 0.12 Amps.

4. The “Test Cutoff Voltage” should be set at 1/3 of the nominal voltage of the battery pack. For example: a pack of 5 NiCd cells rated at 1.2 volts per cell has a nominal voltage of 5 x 1.2 = 6.0 volts. The Test Cutoff Voltage for this battery pack should be set at: 6.0/3 = 2.0 volts.

5. Now click on the “start” button on the screen to start the reconditioning process. The battery pack will be discharged at the “Test Amp” rate that you set, until the voltage gets down to the set value of “Test Cutoff Voltage”.

6. The printout on the screen will show the pattern of Amp-hours vs voltage during the discharge, but this information is not really useful to you.

7. The battery should now be recharged completely and then tested to measure its new capacity. Typically most of the improvement will show up in the test after the first reconditioning. If necessary the battery can be reconditioned up to two more times if you get additional capacity each time.

Learn how to recondition any battery by clicking on the image below

Source: reconditionbattery.com; http://siongtet75.ezbattery.hop.clickbank.net/

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