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Handheld battery tester with built-in thermal printer, dark plastic casing, compact rectangular shape

OBDMONSTER BM550U Battery Tester with Printer 6V 12V 24V

SKU CH-Y4NK-BGG6E

Tests 6V, 12V and 24V batteries from 100 to 2000 CCA and prints thermal reports instantly

  • Team affiliation1 Piece
  • Key features1*Battery Tester 1*Thermal Paper (x2) 1*User Manual, Battery
  • Product weight0.95 lb (0.43 kg)
  • Product typeOhmmeter, Voltmeter, Ammeter
  • Built-in thermal printer creates instant paper reports
  • Measures internal resistance, voltage, SOH, SOC and CCA
  • Tests 6V, 12V and 24V lead-acid, AGM and gel batteries
  • Supports both off-car and in-car testing modes
  • Lightweight 0.95 lb design with 100–2000 CCA range

What the BM550U battery tester does

The OBDMONSTER BM550U is a handheld electrical-system tool that measures internal resistance, voltage, state of health, state of charge and cold-cranking amps on 6 V, 12 V and 24 V lead-acid batteries. It covers regular flooded, AGM flat, AGM spiral and gel types across a 100–2000 CCA range. Lithium chemistries are not supported. The unit is aimed at professional technicians and home owners who want immediate paper proof of battery condition.

Built-in printer and bundled supplies

An integrated thermal printer produces a hard-copy report the moment a test finishes, removing the need to write results down or transfer files. Two rolls of thermal paper ship in the box so the printer is ready for the first jobs. A user manual completes the package; no external power supply or software installation is required because the tester runs from the battery under test.

Installation and common pitfalls

Clamp the colour-coded leads to the battery terminals, select the voltage and chemistry, then press start — the sequence takes seconds on or off the vehicle. The main error is attempting to test lithium packs, which the firmware rejects. Cold terminals or heavy corrosion can skew resistance readings, so clean contact points before clipping. The tester weighs under 1 lb, so one-handed operation in tight engine bays is straightforward.

How it compares

Measured against everything we stock in Multimeters & Electrical Testers, at today’s prices. Recalculated every night.

Price $51.99
Pricier than about 75% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameOBDMONSTER
Product typeOhmmeter, Voltmeter, Ammeter
Size & build
Product weight0.95 lb (0.43 kg)
More details
Team affiliation1 Piece

Questions about this item

How often does the thermal paper roll need replacing on the BM550U?

Each roll prints many battery reports; the box includes two rolls so you can swap them without downtime.

What is the highest cold-cranking-amp rating the BM550U can measure before it hits its limit?

The tester reads up to 2000 CCA, so batteries rated above that will exceed the measurement range.

Does the BM550U get hot or drain its own battery during all-day shop use?

At .95 pounds the unit stays cool and runs on internal power, so extended testing sessions do not produce noticeable heat or rapid battery drain.

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