These internal resistance baseline values from Alber research, battery manufacturers, and our customers will help determine the health of your batteries.

The average values in micro-ohms, taken on known-good batteries at 100% capacity, are to be used as guidelines only. Alber recommends you maintain baseline readings for your batteries based on manufacturers' data.

Taking Readings
When you take readings, you should record: Internal cell resistance; measuring instrument used, such as the Cellcorder; battery manufacturer, model and size (Ah); battery age; install date; date of test; and room temperature.

The batteries you measure should be either on-line or on-charge for at least 90 days. Connect the measuring instrument to the battery according to the equipment manufacturer's instructions, and observe the safety precautions below.

Listed readings are based on tests done at room temperature, typically 77F. Alber has observed that only extreme temperature variations affect cell resistance readings.

Contributing Your Readings
We would be pleased to add your resistance readings on 20 or more healthy batteries to our database. Your data should show: Internal cell resistance; measuring instrument used; battery manufacturer, model and size (Ah); battery age; install date; date of test; and room temperature. Or, if you have a Battery Analysis System ADF file, we can extract the data. To contribute your readings, contact our Engineering department or e-mail the ADF file.

Downloading a BLF File
You may download a file that contains resistance reference values for your CRT-300. This BLF battery list file for the Cellcorder BAS program has baseline data searchable by manufacturer and model number. If you already have battery baseline data, you should download then import the file, so your existing baseline data is not overwritten.

Safety Precautions
Hazardous voltages and chemicals may exist on batteries and in battery rooms and cabinets. Only qualified, properly trained personnel should conduct measurements on any battery. Always observe electrical safety precautions. Always wear safety glasses and protective clothing when required.

This data was updated on 16 July 2005. The values are subject to change as new data is received. Before measuring your batteries, read the safety precautions.

Internal Resistance Baseline Values