Hioki Battery Testers

Professional battery internal resistance testers for UPS, telecom and industrial batteries.

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Shop Hioki Battery Testers

BT3554-51

Hioki BT3554-51 Battery Tester

Battery internal resistance tester with PIN TYPE LEAD 9465-10. 4-wire AC internal resistan...

₹1,99,295 ₹1,69,401 + 18% GST

BT3554-52

Hioki BT3554-52 Battery Tester

Battery internal resistance tester with L2020 PIN TYPE LEAD for longer reach testing. 4-wi...

₹2,06,785 ₹1,75,767 + 18% GST

What is a Battery Internal Resistance Tester?

A battery internal resistance tester measures a battery's DC voltage and its internal resistance using a 4-wire AC measurement at 1kHz. Rising internal resistance is one of the earliest and most reliable signs of battery degradation — often visible well before voltage drops noticeably.

Why this matters: In India's unreliable power grid, UPS and inverter batteries are crucial for business continuity. A failed battery during a power outage can shut down your entire operation. Regular internal resistance testing catches weakening cells before they fail.

Key advantage: Testing can be done without disconnecting the battery from its host system, so routine checks don't require taking equipment offline.

Why Choose Hioki Battery Testers?

Hioki's BT3554-51 and BT3554-52 are trusted for UPS, telecom and industrial lead-acid battery maintenance:

1. 4-Wire AC Internal Resistance Measurement

The 4-wire method eliminates contact resistance from the reading, giving an accurate cell resistance measurement even through aged or slightly corroded terminals.

2. Test Without Disconnecting the Battery

Measurement can be performed while the battery stays connected to its host UPS or system — no need to take equipment offline for routine checks.

3. Instant PASS/WARNING/FAIL Diagnosis

The comparator function compares each reading against a reference value and flags PASS, WARNING or FAIL automatically, so you don't need to interpret raw resistance numbers on the spot.

4. Built for Multi-Cell Battery Bank Testing

Test individual cells across a large UPS or telecom battery bank in under 2 seconds each, with results saved automatically to memory — identify the specific weak cells before they take down the whole bank.

5. Data Storage and Transfer

Store up to 6,000 measurements and export them via USB or Bluetooth (with the optional Z3210 adapter) to the GENNECT Cross app for record-keeping and reporting.

The Two Hioki Battery Testers We Stock

Same instrument, different bundled probe — choose based on how your battery bank is installed:

Model	Probe	Best For	DC Voltage	Resistance Range
BT3554-51	9465-10 Straight Pin Lead	Open cabinets with easy terminal access	6V-60V	3mΩ-3100mΩ
BT3554-52	L2020 Angled Pin Lead (longer reach)	Enclosed racks with restricted access	6V-60V	3mΩ-3100mΩ

Battery Testing Applications in Indian Industry

Battery internal resistance testing is critical across these sectors:

UPS & Inverter Battery Maintenance

Test lead-acid batteries quarterly to catch weakening cells before sudden failure. Test each cell in a bank individually to find the specific problem battery before the whole bank fails.

Solar Battery Bank Maintenance

Many Indian solar installations still use lead-acid battery banks for storage. Regular internal resistance testing shows degradation before it causes system downtime.

Emergency & Backup Power Testing

Test backup power battery banks before critical operations to confirm emergency lights, exit signs and backup equipment will actually work when needed.

Data Center & Server Room UPS

Data centers often run hundreds of individual battery cells. Systematic per-cell testing with saved results catches degradation patterns and helps plan replacement before failure.

Telecom Tower Battery Banks

Telecom backup batteries are often in enclosed cabinets with restricted access — the BT3554-52's longer-reach probe is built for exactly this.

Frequently Asked Questions

How often should I test UPS batteries?

Quarterly (4 times a year) for critical systems is a common standard, with bi-annual testing acceptable for less critical installations. Always test after any power event or if performance seems degraded.

Can I test batteries while they're installed in equipment, without disconnecting them?

Yes — this is one of the main advantages of this instrument. The BT3554-51/52 can measure a battery's voltage and internal resistance while it stays connected to its host UPS or system, so routine testing does not require taking equipment offline.

What internal resistance indicates a bad battery?

It is relative to that battery's own reference/initial value, not a fixed number. As a general guide: resistance around 1.5x the initial value triggers a WARNING, and around 2x the initial value indicates FAIL. The instrument's comparator function applies this automatically once you set the reference value.

What voltage range does this cover?

Two ranges: 6V and 60V DC. This comfortably covers individual 2V/6V/12V lead-acid cells as well as larger 24V/48V battery bank measurements.

Why do batteries degrade over time?

Chemical reactions inside batteries are irreversible. Heat, frequent charging cycles, and age all accelerate degradation. Regular internal resistance testing shows the degradation rate and helps you plan replacement before failure.

Is it safe to test large UPS battery banks?

Yes, when following proper procedure. The instrument applies a safe, low-level AC test signal rather than high current. Always follow the manufacturer's safety guidelines when working around large battery banks, which store significant energy.

What's the difference between the BT3554-51 and BT3554-52?

They are the same base instrument with a different bundled test lead. The BT3554-51 comes with the standard straight 9465-10 pin lead, suited to open cabinets with easy terminal access. The BT3554-52 comes with the longer L2020 angled pin lead, designed to reach terminals in enclosed or deep battery racks where the standard lead cannot reach.

Buy Hioki Battery Testers in India

Industrial Supply Syndicate is an authorized independent reseller of Hioki battery testers in India. We stock the complete range and ship pan India with GST invoice. For bulk orders, institutional procurement, and tender requirements, please contact us for special pricing.