All Extech Products

Extech BT100 Battery Capacity Tester

Reward Points (?)

Logged in, worth £5.45, read more.

£654.00 £545.00
Only 1 in Stock Free UK Delivery* Delivery Options

UK - Mainland

England, Wales and most of Scotland.

Standard Delivery - Typically Next Working Day
If items in stock1

FREE Over £249
£3.99 Under £249

Guaranteed Next Working Day Delivery


Guaranteed Next Working Day Delivery: Pre-Noon


Weekend Delivery: Pre-Noon


UK - Highlands & Islands

Includes Northern Ireland (excludes Gibraltar).

Standard Delivery - Typically 2-3 Working Day
If items in stock1



Calculated at checkout.

Note: Time frames based on orders placed weekdays before 3:00pm. Prices Ex VAT.

1 See delivery page for more details.

Advice & Support
Price Match Request

Measure the internal resistance and output voltage of a wide variety of batteries, including lead storage cells, nickel-cadmium, lithium-ion and nickel-metal hydride batteries with this tester.

The Extech BT100 uses a four-terminal measurement method when testing, eliminating the effects of lead and contact resistance to ensure accurate results. The meter is fully suitable for testing active (online) batteries without the need to disconnect.

This battery tester measures both battery voltage and resistance simultaneously to gain comprehensive, highly accurate results. A built-in datalogger can be used to manually store up to 999 sets of data and direct interfacing with PC allows the user to further interact with testing data by using Extech's included software package.

Extech BT100 Battery Capacity Tester Key Features

  • Four terminal measurement method eliminates lead/contact resistance
  • 1kHz test current with up to 10μΩ resistance resolution
  • Dual display - simultaneously shows internal resistance and battery voltage
  • Comparator function with up to 99 sets of resistance/voltage data for battery deterioration characterisation
  • Memory - can store up to 999 (manual) or 9600 (automatic) data entries
  • Interface with PC using RS232 port and Extech's software
  • Resistance range up to 40Ω
  • Voltage range up to 40V

What's Included?

  • Extech BT100 Battery Capacity Tester
  • Software with Cable
  • Kelvin Alligator Clips
  • Kelvin Test Leads
  • 6 x AA Batteries

Extech BT100 Technical Specifications

Resistance Measurement Method 4 x terminal Kelvin connections
A/D Conversion Dual slope
Displays Dual LCD for measurements and programming icons
Three (3) test status LEDs
Datalogger Sampling Rate 1 to 255 seconds (interval time between logged readings)
Open-Circuit Terminal Voltage 3.5Vpp max
Input Overrange OL display
Low Battery Display Icon on screen
Test Current Fault Detect Icon on screen
Auto Power Off After approximately 30 minutes
Zero (Relative) Function Circuit offset voltage is displayed as 0V
Hold Function Display Freezes
Audible Alarm Function Audible alert for warning and failure conditions (can be set ON or OFF)
Comparator Settings Resistance high/low limits and voltage threshold point
Number of Comparator Configurations 99 sets
Comparator Output Test status LEDs for Pass (green), warning (yellow), fail (red) results audible tone for warning and fail conditions)
1 Reviews
Overall Rating

Write a Review

Write Your Own Review
You're reviewing:Extech BT100 Battery Capacity Tester
Your Rating
Additional Information
Manufacturer Part Code BT100
Country of Origin Taiwan

Subscribe to our Newsletter

International Enquiry