  
BATTERY TESTING INSTRUCTIONS w/ Voltmeter
Battery Test, (by USER), with a VOLT-OHM Meter:
- Take a reading on your Battery in question in DC volts. Write down the reading.
- Place battery in A KNOWN GOOD CHARGER for 3 to 5 minutes.
- Take another reading on the battery, IF it is NOT up to the max voltage of the battery, It IS INTERNALLY SHORTED, AND SHOULD NOT BE CHARGED FOR THE RECOMMENDED TIME. It will melt down a new charger. It needs to be replaced.
EXAMPLE: A Bosch 18.0 volt battery reads 10.5.
After 4 minutes of charging on a GOOD Charger, it now reads 11.6.
THIS BATTERY IS BAD AND SHOULD BE REPLACED, NO FURTHER USE OF ANY KIND. (Will burn up any good charger.)
Same battery after 4 minutes on charger, reads 18.0 volts.
BATTERY IS GOOD TO USE.
BATTERY TESTING INSTRUCTIONS w/o Voltmeter
- Take a known good or new 3 Hr. Charger such as the Skil 92370, 92490, 92590 or 92990 (1 Hr. Smart Chargers such as the Skil 92913, 92991 or 92910 can detect a bad battery and not try to charge it).
- Start charging the battery in question while at the same time monitoring the temperature of the batter / charger.
- If the battery is approaching a temperature that is too hot to touch remove it from the charger or power source as soon as possible. This batterry is causing the charger to heat up too much and will damage the charger as well. Please dispose of this battery properly.
- Usually this will happen with the first couple of minutes but do monitor it carefully for the first charge cycle of each battery.
- If the charger is damaged at this point the Robert Bosch Tool Corporation will not replace the charger nor will Dixon Industries (www.BoschPowerToolSource.com).
- If the battery / charger gets warm but not hot the battery is OK and should fully charge in about 3 hours.
New chargers that were purchased, and have melted / quit after the first charging of old batteries WILL NOT BE REPLACED FREE OF CHARGE, until ALL the old batteries have been sent in for testing.
Instructions provided by: Robert Bosch Tool Corporation, Houston, Texas.
Free Battery Testing
This test is not fool proof. You really need specialized equipment to know for sure if your battery is good or bad.
We will test your battery for Free and give you a detailed report. Then you may have your battery or batteries Reconditioned to an almost like new state or disposed of.
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