Extech BT100 Battery Capacity Tester

Fits UPS, telecom, and industrial battery-string maintenance where you need on-line AC milliohm capacity checks with simultaneous DC voltage — without disconnecting the battery.

Key advantages

On-line AC milliohm — capacity-style checks without disconnecting the battery string.
~40 mΩ…40 Ω class — AC milliohm ranges with simultaneous DC voltage (~4 V / 40 V; max ~50 VDC).
Built-in datalogger — stores measurement sets for maintenance records; PC kit options.
Kelvin lead kit — handheld form with alligator clips / test leads for string work.

Typical applications

UPS and telecom battery-string maintenance rounds.
Industrial DC banks needing on-line internal resistance trend data.
Shops logging string health without taking batteries offline.

Selection guide

Type — Extech BT100 battery capacity / AC milliohmmeter for on-line battery condition checks.
Resistance — AC milliohm ranges covering about 40 mΩ to 40 Ω class measurements.
Voltage — Simultaneous DC voltage on about 4 V / 40 V ranges; max input about 50 VDC.
Logging — Built-in datalogger stores measurement sets for battery maintenance records; PC interface software kit options.
Form factor — Handheld tester with Kelvin alligator clips / test leads.

Common mistakes

Applying the meter above the listed max input about 50 VDC — confirm string voltage before connecting.
Expecting a full discharge capacity tester — BT100 is an AC milliohmmeter / on-line condition checker, not a load-bank discharge system.
Skipping Kelvin clip condition — poor clip contact skews milliohm readings on string maintenance.
Assuming PC software ships in every kit — interface software is listed as kit options; state need on the RFQ.
Test & measurement instruments · Test & measurement buying guide
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When to RFQ / what to tell us

Battery string voltage class vs ~4 V / 40 V ranges and max ~50 VDC.
Milliohm band of interest (~40 mΩ to 40 Ω class) and datalogger / PC software need.
Quantity, ship-to, and whether Kelvin clips/leads must be included or replaced.

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Specs

Spec	Value
SKU	24234
Brand	Extech
Model	BT100 Battery Capacity Tester
Product type	battery_tester
Type	Extech BT100 battery capacity / AC milliohmmeter for on-line battery condition checks
Resistance	AC milliohm ranges covering about 40 mΩ to 40 Ω class measurements
Voltage	Simultaneous DC voltage measurement on about 4 V / 40 V ranges; max input about 50 VDC
Datalogger	Built-in datalogger stores measurement sets for battery maintenance records
Functions	On-line testing without disconnecting the battery; auto power-off; PC interface software kit options
Form factor	Handheld battery capacity tester with Kelvin alligator clips / test leads
Applications	UPS, telecom and industrial battery string maintenance
Document	Extech BT100 datasheet + OEM netx-assets product photo (extech.com)

Documents

Extech BT100 product page / documentation — request the current OEM PDF on RFQ (no direct public PDF URL stored for this SKU).

FAQ

Q: Can BT100 test without disconnecting the battery? A: Yes — on-line testing without disconnecting the battery is listed. Confirm string voltage vs max input about 50 VDC.

Q: Is it a discharge capacity bank? A: No. It is an AC milliohmmeter / battery capacity condition tester with simultaneous DC voltage and datalogger.

Q: What should I send for a quote? A: String voltage, milliohm band, PC software need, quantity, ship-to. Compatible with systems using Extech BT100 — we do not claim authorized-dealer status.

Parameter	Value
Measurement Type	AC milliohmmeter battery-condition tester; online test without disconnecting battery
Resistance Ranges	40 mΩ, 400 mΩ, 4 Ω, 40 Ω (resolutions 10 µΩ to 10 mΩ)
Resistance Accuracy	±(1% reading ± 10 digits)
Voltage Ranges	4 V, 40 V DC (1 mV / 10 mV resolution)
Voltage Accuracy	±(0.1% reading ± 6 digits)
Max Input Voltage	50 V DC
Datalogging	999 manual sets; 9600 continuous datalogging sets
Power	6× AA batteries; ~7 hours battery life
Dimensions	9.75 × 4 × 1.75 in (250 × 100 × 45 mm)
Weight	17.5 oz (500 g)
Included	Windows software with cable, Kelvin alligator clips, Kelvin test leads, 6 AA batteries
Special Features	Simultaneous DC voltage and AC milliohm measurement; auto power off
Form Factor	Handheld battery capacity / condition tester