TOPDON BT300P Battery Tester: Is Your Electrical System Healthy?

The TOPDON BT300P Battery Tester analyzes battery health, cranking voltage, and the whole charging system on vehicles new and old.

Whether you own a classic Mercedes or the latest and greatest AMG super sedan, it’s imperative to have a properly functioning electrical system. With modern vehicles, or anything that sits around for weeks at a time, drained and dying batteries lead to all sorts of hassles, from the obvious “I-need-a-jumpstart” to malfunctioning computers and sensors. (Hello, check engine light and diagnostic trouble codes!) Enter the TOPDON BT300P battery tester.

A battery tester is a great way to check in periodically to prevent an unwanted breakdown (or the aforementioned diagnostic trouble codes.) TheBT300P is a professional tester for working pros and DIY enthusiasts alike. It can check the battery’s overall health, its cranking voltage, and even the whole charging system.

That way, you can get a new battery before your old one leaves you stranded. Or if you do find yourself needing a jumpstart one day, you’ll know whether or not you should try to save or replace your current battery. Since getting this BT300P in for review, it has taught me a lot about the health of my humble fleet’s batteries and saved me at least one breakdown.

Here’s everything you need to know about the BT300P and whether or not you should buy one.

Full disclosure: TOPDON is an MBWorld sponsor and they commissioned this review. All facts have been approved by TOPDON. All opinions remain my own.

Features & Tests

The TOPDON BT300P is a rectangular plastic device with a simple button interface, small screen, and attached positive and negative cables. The kit includes a carrying case with a paper instruction manual and two extra rolls of paper for printing test results. (One roll comes pre-loaded.)

The BT300P offers three testing features —

1. Battery health (health of battery and overall state of charge)
2. Cranking health (tests starting voltage)
3. Charging system health (too high, too low, or just right)

To test the battery health, simply connect the positive and negative cables, select your battery type, and the number of cold cranking amps listed on the battery, then press enter. Please note, however, that, according to TOPDON,

If the battery charge is too high or too low, it will affect the test results. If the battery charge is too high, there is usually floating electricity. In this case, it is generally recommended that customers turn on the car headlights for 2-3 minutes and remove the floating electricity before testing. Low battery may be caused by excessive use of the battery and not charging it in time. In this case, it is also recommended to charge it for a period of time before testing.

In short, don’t test a battery that’s been sitting around too long, nor one that’s been charged too much.

To test the cranking system, navigate to that test in the menu and, following the prompts on screen, start the vehicle. Results will follow with these starting voltages —

• <9.6V is LOW
• 9.6V≤ and <10.7V is NORMAL
• ≧10.7V is GOOD

And, lastly, with the vehicle running, the BT300p can test the health of the charging system at idle and then, once prompted, at 2,500 RPM. Again, results follow on screen.

Printing results is as easy a pressing Print.

Testing the Battery Tester

I used the BT300P to evaluate several vehicles —

• 2006 Corvette (3 year old battery, weekly driver)
• LS3 Swapped Roadmaster Wagon (1.5 year old battery, weekly driver)
• 2013 Mustang Boss 302 (6 year old battery, weekly driver)
• 2013 Cadillac ATS (10 year old battery, daily driver)
• 1987 Mercury Cougar (2 year old battery, weekly driver)
• 2013 Toyota Tacoma (1 year old battery, daily driver)

According to TOPDON,

The BT300P adopts the world’s standard conductivity testing technology to test the real-time characteristics of the plates inside the battery to determine the battery’s cold start capability. Comprehensively judge the quality of the battery through parameters such as voltage, CCA, SOC, and SOH.

In retrospect, the results were fairly predictable. Newer batteries on cars more regularly driven were generally healthy. Older batteries on vehicles that sit around too much were nearing the end of their lifespan. My Roadmaster had managed to eat one battery, which was covered under warranty. In the case of my Mustang, the BT300P likely prevented me from getting stranded after too many short drives. And on two occasions, the batteries themselves were too undercharged for proper testing, and the results had to be redone after a quick drive.

In several cases, mostly involving older batteries, I cross-checked the BT300P’s results with the help of my local O’Reilly’s (not sponsored), and the TOPDON product produced similar results without the hassle of having to drive anywhere and/or remove a battery for testing.

TOPDON BT300P Pros & Cons

My overall experience with the TOPDON BT300P is positive, but I did have a few complaints. Here are a list of pros & cons:

Pros

• Simple to set up & quick to use
• Accurate results (verified versus part store testers)
• Routinely testing batteries can help get replacements before a warranty ends

Cons

• The paper likes to jam in the printer if not torn away perfectly each time
• The cranking and charging system tests require two people as the cables are very short
• Undercharged and recently charged batteries can give incorrect results

Who Should Buy a BT300P?

Although the TOPDON BT300P is pitched for professional automotive technicians and DIYers alike, I’m more apt to recommend the product to the pros. Basically, if you need the printer for documentation (to provide to customers who want proof before making an expensive purchase), it’s a great battery tester.

A DIYer with a small or large collection may also find the BT300P useful, especially if they already have trickle-style chargers in place for vehicles that sit a lot.

However, when learning about the BT300P on TOPDON’s website, I stumbled upon the TB6000Pro and would recommend that a little more for DIYers or those with a small collection of cars. Why? The TB6000Pro combines battery testing with battery charging, and it can be live-monitored via Bluetooth. In other words, it’s more useful. Also, outside of the customer experience, I’m not sure a DIYer would want to deal with printing physical paper. That’s not to knock the BT300P, mind you. Just a recommendation for those who might be in a similar situation.

Click HERE to purchase a TOPDON BT300P Battery Tester!

or

Click HERE to purchase a TOPDON TB6000Pro Intelligent Battery Charger & Tester!

Images: Michael S. Palmer & MBWorld member xXHotelCrazyXx