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TOPDON

Car Battery Tester 12V 24V 100-2000CCA Lead-Acid Battery, TOPDON BT300P Alternator Tester, Load Tester, with Built-in Printer, Spark Free Metal Clamps, Automatic Reverse Polarity Protection

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Availability: Only 10 left in stock, order soon!
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Arrives Thursday, Jul 30
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Features

  • [12V Battery Tester] The BT300P is a quick and accurate battery tester that offers printed diagnostic receipts. Know everything about the health of 12V batteries, the 12V & 24V starter motors cranking status, and 12V & 24V vehicle electronic systems charging condition. This is TOPDONs newly developed battery tester that ensures your batteries are always working at an optimum level.
  • [Wider Application] This device works on a wide variety of 12V automotive lead-acid batteries, such as 100~2000CCA regular flooded, AGM flat plate, AGM spiral, Gel, and EFB. It detects the failure of the starting and charging systems in 12V & 24V cars, motorcycles, trucks, RVs, ATVs, SUVs, boats, yachts, and even lawnmowers. Most vehicle issues caused by a defective battery can be fixed with the BT 300P.
  • [Fast & Accurate Test Results] Featuring TOPDONs latest conductive battery testing technology, this modern battery tester can identify the exact reason why your battery failed in only 3 seconds. Research shows that its results provide an accuracy of 99.5% - more precise than competing battery testing equipment.
  • [User-Oriented Battery Load Tester] Its 2.4 color screen shows crystal-clear readings at any lighting condition. Intuitively placed buttons allow you to toggle menus with ease. With the built-in thermal printer, you wont have to worry about running out of ink. No ribbons, cartridges, or other supplies are needed for its use. Standard thermal paper is the only refillable supply required to print your test results.
  • [Extra-Safe Operation] With spark-free copper clamps, PVC-coated wiring, and built-in automatic protection against reverse polarity, the BT300P provides the extra safety you need when battery testing. Its insulated ABS shell prevents current leaks and can withstand damage. With an extra-long 31.5 cable, this car battery tester is even more convenient to use.

Description

Visit the Store Visit the Store Visit the Store TOPDON has been a leader in the automotive industry offering a wide range of battery testers, all of which have been hailed as reliable and innovative. This TOPDON BT300P showcases the same brilliant design and quality as other BT series testers: Often you get stranded in the middle of nowhere with no mechanics nearby, all due to a bad battery, right? This car battery tester TOPDON BT300P is a cost-efficient method to test your battery, making sure it has enough juice to drive the car before you hit the road. Our digital battery testers can help you diagnose faults with direct test results: “GOOD, BAD, REPLACE, or RECHARGE”. Simply connect the tester to check battery health condition: CCA value/rating, voltage, internal resistance, state of health (SOH), and state of charge (SOC). State of health (SoH) is a figure of merit of the condition of a battery (or a cell, or a battery pack), compared to its ideal conditions. State of charge (SoC) is the level of charge of an electric battery relative to its capacity, SoC is normally used when discussing the current state of a battery in use. Set this battery tester to cranking test mode and then start the vehicle. The result will tell if your 12V & 24V electrical system can generate enough power to start the engine. Loaded Voltage means the voltage measured when turning on on-board electrical appliances, such as headlights. Unloaded Voltage means the voltage measured when turning off all the on-board electrical appliances. Use this load tester to routinely check your 12V or 24V charging system of vehicle, to gauge alternator health and troubleshoot charging issues. No more lagging behind and false test results. This 12V battery tester runs super-fast and adopts cutting-edge conductance testing technology for 99.5% accuracy. This car battery tester is a handy tool to ensure your batteries are always working at an optimum level. Worthy as an addition to the toolbox collection for automotive mechanics, 4S repair stores and battery manufactures. This automotive load tester comes with a great carrying bag, which fits the unit itself quite well to provide extra protection against bumps or accidents, and is dust-proofing. It is also perfect to store in your glove box. Package list: 1*BT300P; 1*Carrying Bag; 1*User Manual; 3*Printer Paper. This advanced battery tester will automatically turn on as soon as being connected, welcoming you with a bright and nicely pixelated 2.4” color screen. It will present quality test result that is quick to read in a dark garage, under the hood, or even under natural daylight. More, the built-in printer is there when you feel the need to attach a printout to a work order. You can print the test result out directly, share it with your customers or keep the printing records for future reference. Paper Change Never worry about running out of ink as it is the thermal printer. **NOTE: Print function ONLY works on 12-16V cars. NO Bluetooth connects. TOPDON is a brand that is synonymous with safe and advanced technology and this battery tester BT300P is no different. It can automatically monitor the battery activity to make the testing safer and more efficient due to the following built-in protections:

Brand: TOPDON


Power Source: Battery Powered


Style: For Car Truck Motorcycle ATV SUV Boat Yacht


Color: Black


Item Weight: 1 Pounds


Power Source: Battery Powered


Minimum Operating Voltage: 12 Volts (DC)


Upper Temperature Rating: 55 Degrees Celsius


Measurement Type: Voltmeter


Style Name: For Car Truck Motorcycle ATV SUV Boat Yacht


Color: Black


Item Weight: 1 Pounds


Item Dimensions: 12 x 8.5 x 4.5 inches


Specification Met: Cca, Jis, En, Din, Sae, Iec


Brand Name: TOPDON


Model: BT300P Battery Tester


UPC: 850052860714 632111336411


Warranty Description: TOPDON offers 30 days return & 12-month friendly customer service.Safety tips It’s important that you always turn off your car’s ignition when testing your battery, and always read the safety features section in the manual carefully to ensure optimum safety.


Manufacturer: TT TOPDON


Part Number: BT300P


Included Components: 1*BT300P Car Battery Tester; 1*Carrying Bag; 1*User Manual; 3*Printer Paper


Unit Count: 1.0 Count


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Jul 30

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • A great Car and Boat Battery Tester with a Printer for a Reasonable Price
Only used the TOPDON Battery Tester three times but worked well each time. Tested a New battery before charging showed good and 86% charged. Charged battery and it showed good and fully Charged. Had Three Marine batteries that stopped working. I tried charging two would not take a charge so TOPDON could not read any charge. The Third Battery showed 22% charge and needed to be replaced. They were under warranty and the battery diagnostic analysis print out was accepted for warranty replacement. A great piece of equipment for a very reasonable price. Having a printer is a bonus. Does Battery test and a charging test, Yould recommend for Boat and Car Battery testing. ... show more
Reviewed in the United States on January 17, 2026 by Jess B
    • Defective?? Defective??
Review Image by ROZ3Y
Review Image by ROZ3Y
Review Image by ROZ3Y
Review Image by ROZ3Y
I work on a shop that i test battery frequently, i have two unit which is the BT600 and my personal battery tester which is the BT300P. I keep on getting battery failure or testing battety over and over again, this time it is saying too low on my personal battery tester but when i use our shop yesterday it pass? Is someone having the same issue?? This gets a -5 star if Topdon dont respond or help me with this. Update: Topdon was on top of this unit and replied back to me. I might have just received a bad unit, but Topdon replaced my unit as soon as the info they requested was given. From 1 star to 10+ stars for backing their product and awesome support. Thank you again. ... show more
Reviewed in the United States on March 7, 2026 Reviewed in the United States on March 7, 2026 by ROZ3Y
    • Great Battery Tester! Good Accuracy and nice features. Definitely worth having.
I had been on the fence about getting a battery analyzer for many years. But since my boat batteries were getting old this year, I decided to buy a tester rather than to find out I had a battery on the water; or have to take my batteries to a shop to be tested. There are a lot of testers out there and it was difficult to make a decision. After reading and watching many reviews, I decided to buy a TOPDON tester. The main factor that made me decide upon the TOPDON was a YouTube video where a guy compared several of these portable electronic analyzers to an expensive shop analyzer from his auto repair shop. In the tests he performed, the TOPDON was closest (if not exactly the same) as the numbers he was getting from an analyzer that costs thousands. Then I had to decide upon model; I didn't want the cheapest one, but I also wanted one with some advanced features. I ended up with the TOPDON BT300P. The BT300P has multiple tests that you can perform on your battery; it also has the advantage of being able to print out the results. I find the print feature to be a nice addition because now I can test my batteries and save the printouts to compare the results of my tests over time. In addition, it will test nearly any type of battery that you desire; you make the battery type and CCA selection when setting up for the test. My thought is that I will be able to see the regression of the batteries over time and be able to make a new purchase decision before I'm left stranded. I tested six batteries with this on the first day I had it: two old Deep Cycle trolling batteries from my boat, one old starting battery from my boat, the main battery from one of my cars; and the two new Deep cycle trolling batteries that I wound up buying for my boat as a result of testing. The boat starting battery came back as good; it definitely is showing its age as the cold cranking amps were a bit lower and the health registered as 83%; but still good nonetheless and it does still work. The two old Deep Cycle batteries were another story. These two batteries were reading good with a multimeter and my boat onboard charger showed green for them as well. But when I tested these two Deep Cycle batteries with the BT300P; it immediately flagged then as having bad cells. So, after that test, I turned on the trolling motor to test them and sure enough it died withing a few minutes of turning it on. If I didn't have this tester, I would have taken my boat out based on multimeter readings and the onboard charger indication; and I would have been stuck out on the water without my trolling motor working. The two new Deep Cycle batteries that I bought tested 100% health and also show more MCA and CCA than the battery was rated at: so definitely good new batteries. My car battery that I tested was really just so I could get a feel for whether or not I would have confidence in this tester. The test on my car battery showed a slight decline in health (91%) and a very small drop in CCA; it was what I would expect from a 3- and 1/2-year-old battery. So, after testing all these batteries, I can honestly say that I do have confidence in the results of this battery tester and given the accuracy, features, and price point I can highly recommend the BT300P if you think you may need to purchase a battery analyzer/tester. Some things to consider that may possible debunk some of the bad reviews here: 1. You must know your battery type and CCA and make the proper selection. The first two times that I tested my boat starting battery; it showed failed. I was a bit perplexed as most of the numbers appeared to be adequate. Then, I discovered it was my fault because I was selecting the wrong battery type. Once I verified the battery type and made the right selection; it passed (still providing the same numbers). 2. Yes, you do need a good connection to your terminals. This wasn't an issue for me since I keep my terminals clean. But if I were to test my old truck battery; I would probably need to clean things up first. Connection isn't an issue providing that you ensure you have a good clean, corrosion free surface to work with. 3. The cables could probably be a bit longer. However, the shorter cable length was not a problem. I would actually rather have the shorter cables as the BT300P does, because longer cables would mean that the tester and cables would require a bigger footprint in my toolbox. The tester and cables fit nicely in the tester tool pouch (included with purchase) and it doesn't take up too much space; like my jumper cables do (for example). CONCLUSION: I am completely satisfied with my purchase of the BT300P. I have been thinking about buying a battery tester for years; but really wasn't sure what to buy. The number of tests available and the results that I experienced in my testing gives me confidence that I can accurately assess the health of my batteries at my home; and gives me the information that I need to make an informed decision of whether to continue using or to replace my batteries. I actually caught the BT300P on a one-day sale, which made it less than the BT200. Had the BT300P not been on sale, I would have bought the BT200. However, the print function of the BT300P is probably worth the extra money since you can keep records of your results to track battery health over the life of the battery. Overall, I am really happy with this purchase and have zero regrets. Just identifying my bad Deep Cycle batteries one time made this purchase pay off and prevented me from having a bad day on the water. It is difficult for me to give the BT300P any rating less than five stars. It's been great so far! ... show more
Reviewed in the United States on March 9, 2025 by William J. Snyder
    • Helpful Battery Tester for My Truck Batteries
This battery tester worked well for me. I used it to test the batteries on my truck (I have several batteries), and it helped me understand their condition quickly. The device is easy to use and the screen explains the results clearly in simple language. It shows detailed information about the battery health, charging, and cranking test. The built-in printer is also a nice feature if you want a record of the results. Overall it’s a helpful tool, especially if you want to check your batteries yourself without going to a mechanic. The reason for 4 stars is that the menu took me a little time to understand at first, but once you get used to it, it works great. ... show more
Reviewed in the United States on March 12, 2026 by Ahmad Nurov
    • Must have
Easy to use and accurate, with carrying case. Size is a little but big, accuracy is on spot and the printer it brings a pro vibe on to it
Reviewed in the United States on April 16, 2026 by Rey
    • Great product and price
I purchased this product due to the winter stress on batteries in my vehicle and work vehicle. I wanted something dependable and easy to use and yet affordable. I was amazed at the simplicity and yet professional grade of this item. I am very highly satisfied with it and I brought my printout and the tester to the local auto store to prove my battery was defective and needed warranty replace. They had one obviously but it was quickly handled and replaced with no hassle thanks to this product. I was also able to rightfully test my other batteries in my other vehicles and plan to have them replaced as well due to the status of knowing before I even drive out of my way to the store. So awesome and professional and the price is very reasonable and I highly recommend this product. The replacement printer paper is also very affordable and should last you a long time. It comes with 3 rolls one of which is installed already in the unit. I purchased an extra 12 roll set at a combined reduced price from Amazon. It delivered on time and I love it. Thank you Topdon and Amazon. ... show more
Reviewed in the United States on February 18, 2024 by Jeffrey
    • Topdon is a go to but...
So i recently starting purchasing topdon tools . i got the new diag900 lite scanner and i love what it can do for the price. Its limited with features but does the job when needed. Next i purchased the battery tester that i could use with scanner ( Btmobile pro) and i was happy to start using this with the scanner but it doesnt work with that scanner for some reason so they wanted me to go to the BTmobile pro S . I didnt want to spend ($150) . So i returned the BT mobile pro and next i purchased this BT300p . When i received it i was loving design but then first time used the paper jammed on me 3 times and i didnt like that. So i went on amazon to search though the reviews and confirmed that few other people were having the same issues. So i returned this one also. So right now topdon isnt my go to for battery testers. Right now going to a different brand. Updated info: top don has been in contact with me about this battery tester and they will be checking into it. I really like that companies care what customer think about there products. So I will be working with top don to fix this issue with battery tester ... show more
Reviewed in the United States on November 19, 2023 by Alejandro Guerrero
    • Nice tester
Been having battery issues with my diesel truck This narrowed down what battery was the issue Great that you can print the report Showed to my battery dealer they didn’t question me and did a warranty on the spot for the battery
Reviewed in the United States on February 1, 2026 by firewife

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