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RC-300; Technician Grade Intelligent Handheld SLA and STANDBY Battery Tester For 6V & 12 Applications

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Quick Specs


The RC-300 is a portable, fully featured tester that provides quick and accurate results utilizing AutoMeter's Award Winning "Digital Pulse Load" technology. The RC-300 is uer friendly, instructing the user exactly what to do while testing an SLA battery. Professionally accurate test results are shown on a LCD display after each test. The RC-300 has a built in memory so you can easily review and/or print test results.


Feature Points
  • Tests SLA , Flooded, Gel Cell, or AGM batteries. Also tests discharged batteries and detects bad cells.
  • Applies a true 40 amp load during testing to simulate real world operating conditions and provide more accurate test results.
  • Tests 6V and 12V batteries rated between 4AH - 50AH.
  • Stores the last 50 tests in memory
  • The RC-300 enables the user to "blue print" known good batteries of different types/sizes to drive improved testing accuracy. The unit will store up to 40 different "blue printed" battery types. The user can also set customized pass/fail settings based on
  • Test results include: battery's measured amp hour (AH) capacity, battery voltage and percent of charge, and what the battery's state of health is (good, near end of life, or bad).
  • 30" - 16 gauge leads
  • Customer communication with optional PR-12 (external printer), PR-20 (bolt-on printer), or AC-12 (PC cable).
  • Tough impact resistant plastic housing with easy grip rubber booth that prevents damage to the unit.
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Rated 1 out of 5 by from Need a new battery to test an old battery? Product requires a brand new battery to perform accurate test on old batteries. This was confirmed with the manufacturer. But it is not stated as such in the user manual. The readings it produced without first testing a new battery indicated that my 6 year old batteries had more capacity than they were ever designed to have. And not just a little more, they are 28Ah and this tester tested them to be 38Ah. The manufacturer claims that the tester is a "professionally accurate reserve capacity battery load tester" "quick and accurate results". But it does not provide accurate tests without having a new battery to test an old battery.
Date published: 2022-08-13
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I have an RC-300. Says you can use the AC-12 for pc connections. How does that work? Can you download battery results?

Asked by: pscrev20
Please see "PC Interface" in this instruction:
Answered by: Jim from AutoMeter
Date published: 2023-11-16

Hi , I am using RC-300 , I would like to know the meaning of CF value . How it used and why . Thanks in advance

Asked by: Ayoub
The Correction Factor only comes into play when using the Database of battery types. Due to significant variation across manufacturers of low current batteries, the factory specs may be the same, but the actual performance of the batteries may differ. So you establish a Database of specific batteries, which gives the tester a Correction Factor to properly test that specific battery.
Answered by: Jim from AutoMeter
Date published: 2023-04-28

What testers are still made in USA?

Asked by: Lanny
Thank you for your question. While the majority of AutoMeter products are made in the USA, a majority of our testers including the RC-300 are made in China.
Answered by: Natalia from AutoMeter
Date published: 2021-03-12

I sell electric four wheel scooters for customers with mobility constraints and need tt purchase a battery tester. Which tester is best suited for batteries all 12v but ranging from 20a, 33ah, 55ah, 75 ah and 100 ah

Asked by: Jennifer
Thank you for your question. Please give our tech line a call at 866-248-6356 to assist you further with this.
Answered by: Natalia from AutoMeter
Date published: 2023-08-17

I have RC-300. Can I use it to test Car batteries? Right now I use it mainly for testing our SLA batteries used in our UPS. Or do I need to get SB-300?

Asked by: Bud M
Hi Bud, The RC-300 will not test Automotive batteries. You might want to check out the SB-300: Thanks, Jim
Answered by: Jim from AutoMeter
Date published: 2020-06-11

I have 2 of these and my old one (before it quit working) would allow me to communicate to it through terminal software and pull up the battery history and more, the new one does not. Is there a way to make the new one allow this again?

Asked by: pscrev20
Thank you for your inquiry. There is no way to make the current RC-300 do what you want it to.
Answered by: Jim from AutoMeter
Date published: 2019-12-30

Does the RC 300 require annual manufacturer calibration?

Asked by: Markal
Thank you for your question. No, the RC-300 does not require an annual calibration.
Answered by: Zach from AutoMeter
Date published: 2019-07-12

Does it tests the batteries' Amp Hours (AH) at 20hr, 10hr or 5hr rating? Thank you :)

Asked by: Karan
Thank you for your question. This unit will test batteries with a rating between 4-50 Amp Hours.
Answered by: Zach from AutoMeter
Date published: 2019-11-28
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