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The VDIAGTOOL BT500 is a professional-grade car battery tester and system analyzer compatible with 6V, 12V, and 24V batteries including flooded, AGM, GEL, and EFB types. It offers precise diagnostics with 99.99% accuracy, testing battery health, charge, internal resistance, and cold cranking amps (CCA) from 5 to 3000. Beyond batteries, it evaluates starter and alternator performance to help avoid costly breakdowns. Designed with advanced safety features and a rugged, ergonomic build, the BT500 is ideal for vehicle owners and mechanics seeking reliable, comprehensive battery and charging system insights in a user-friendly package.
















| ASIN | B0DBLKZ3XF |
| Best Sellers Rank | #14,900 in Automotive ( See Top 100 in Automotive ) #23 in Battery Testers |
| Brand | VDIAGTOOL |
| Brand Name | VDIAGTOOL |
| Color | Black |
| Customer Reviews | 4.5 out of 5 stars 330 Reviews |
| Included Components | VDIAGTOOL BT500 car battery tester*1 |
| Item Dimensions | 6.45 x 3.35 x 0.96 inches |
| Item dimensions L x W x H | 6.45 x 3.35 x 0.96 inches |
| Manufacturer | VDIAGTOOL |
| Measurement Type | battery load tester 12v automotive alternator tester |
| Model | BT500 |
| Part Number | VDT-BT500 |
| Power Source | Battery Test, Cranking Test, Charging Test. No Charging Required, Powered By Test Battery |
| Style | car battery tester 6v 12v 24v |
| Style Name | car battery tester 6v 12v 24v |
D**N
Tests batteries charging system and staters all with one tool
I bought this to check my batteries before winter. I can’t afford to replace a good battery and I don’t want to get stuck in the cold with a bad one. The BT500 comes neatly packaged. The manual has clearly worded instructions on how to use the BT500. The BY500 screen is large enough for all the information that will be displayed, bright enough to see in bright sunlight. Using the BT500 is as easy as selecting the test you want to run and following the on screen prompts. I tested my wife’s 5 year old battery and it was in great condition. While I had the BT500 connected I went ahead and tested her car's starter and charging system. Everything tested fine. I had been worried about this battery because of its age but it looks like it should be fine for this winter. It is nice to have a tool that is capable of running multiple types of tests. That feature in itself adds to the value of the BT500. The design is straightforward and easy to use. A USB cable comes with the BT500 so you can connect to your computer and print your test results if you wish. All in all this would be a great addition to your toolbox, because it has been for me. If I were to offer any suggestions for improving the BT500, the only thing I would suggest is to make the cables longer. Testing the charging system requires increasing engine RPM and maintaining a set level for the test. I was able to do this alone on my Versa with the battery close to the driver side firewall. The same test on my pickup requires two people, or jumper cables to extend the reach. Like I said just a suggestion to take care of an easy to work around inconvenience. All in all a good tool and definitely worth having.
R**T
Saved me from a bad battery I had no idea !!!±
I've always wanted to buy a battery testing tool. I just never got around to doing it. But am i glad that I bought this one? Because upon I'm testing my car's battery. came to find out. The state of charge was 100%, but the state of health was only 6%. And also, my battery has a bad cell And luckily, enough, i bought this tool in used it. Prior to my 3 year warranty, being up, so I was able to take my battery back to Costco, and get it replaced before it went bad on me. And before the warranty was no longer active, it's super easy to use once again. The instruction manual is 10 out of 10 all the tools from this company. The instruction manuals are The best I've ever read honestly. I'm not just seeing that build parties. Great, only thing I will say the only complaint I have is that it doesn't come with any type of carrying case. And even if it was just a small leather pouch or a, you know, Velcro strap pouch, anything just to story, you know? I feel like any a tool like this needs some type of pouch or something to go into to put away. That's the only thing I have bad to say about it. Other than that, the charging test works great. Also, the range better and I do like how you can test the battery, whether it's on your car or off your car and get good results. And it's really cool because it shows, you know how much battery health your life hat. What battery has left that way? You know whether or not it's starting to go bad or whatnot, and yeah, it's just really super simple, easy to use. Can I recommend it to any everybody shopping for a battery tester hmm, you can also check the cranking test. You have your battery which will tell you whether or not your starter is good. And then there's the charging test also, what's pretty neat? Is there's actually a wave for mode? So you could see any type of ripples or anything, you know, going on funky. Especially when you start your car and then yeah. You're able to see what kind of wave form it has. If it's steady or not spikes or drops in your power source, you can test pretty much any type of battery. With this thing, a regular lead battery AGM, flat plate battery, an AGM spiral battery and a gel battery able to detect the dead battery. A bad battery. Also, you can save your recorded data. You know, if you want to show a customer or whatever it does have that option. You could save the wave form, or you know, save the entire test or Whatever and you can print it out. To your customer or your friend or whoever can do take a copy? And take it, see what you're actually doing, and what's going on with their battery. One last thing from the wave form. You know, your vehicle voltage analysis, basically you're going to have your discharge voltage around 12 V. That's before you run your key or your Ignition. Then you have your starting voltage, your Ignition voltage. And then after that, once your car is started, then it goes to your charging voltage, and all 3 of these should differ, and the waveform helps you see where you're at and yeah. If you know the battery's good or your charging system, your starting system where it might be a little weak, you just have to find out what your car's are. Normal specs are and kind of compare them.Anyways, this company is great to customer services.I want to see pretty awesome 5 stars best bang for you buck battery tester
B**O
AFFORDABLE, compact, accurate, quality tester with many features! Easy to use.
The shipping of this tester was really fast, received tester in 3 days to Hawaii. It came in a box and the box was packed well to prevent damage. Battery tester's quality is excellent! The tester is thick plastic, the cord does not retain memory when bending, and the battery clip open wide to make sure you have a good connection. The price of this tester is awesome!! It has many features for it's super low price. I have bought a lot of meters and testers in the past. Some only check voltage, a few is a percentage and voltage meter, and usually the load tester is separate. I would carry at least 3 meters to check voltage, load, and percentage. This BT500 can do all those tests and more. It is very simple to set up by connecting the red clip to the positive post and then the black clip to the negative post on your battery. It turns on and the displays show you your options. There are 3 lights to show you off hand your batteries condition. Green is good, yellow means you need to charge, and red is charge and if it can't be charged, it is time to get a new battery. You can verify the lights by going to the testing options. The menu is easy to follow. It will ask you 12 or 24 volts, what type of battery, and the cold cranking amps. The label on the battery has all this information. This tester will tell you the volts, amps, state of health, state of charge, and provide you with a waveform. You can have a tester that tells you your battery has 12 volts but that is meaning less. You need to put a load on the battery and if you have a weak battery with less then 10.5 volts, your car will have a hard time starting if it starts at all. the BT500 tester will also indicate how much your alternator is putting out. You usually need around 13 to 15 volts for your battery to be recharged. I really do not have anything negative to say about the tester itself because it is accurate, durable, and it does everything the company says it does. Very easy to use and very compact. Two things that does not affect my rating because it is not negative. One, I wish it came with a little plastic carrying case, but that is no problem because you can always find one. Two I wish it was touchscreen and that is not a problem because the buttons are marked clearly and is very easy to use. I have tried this tester on my boat, riding mower, motorcycles, and cars and trucks. What I found out on my outboard motor is that the motor has no rectifiers and parts to recharge the battery, and my riding mower had the ability to recharge the battery except when I flipped the mower over it lost its ability to recharge. Now I know exactly how long my boat battery will last before I leave the dock. Being stranded on the ocean due to a dead battery is no fun. All this time I thought my boat battery was being recharged when using the boat. This tester may have saved me from being stranded with a dead battery. I do not think this tester is waterproof so if you take it on your boat, make sure to keep it dry. I am impressed with all the features this tester has and what it can do.
D**K
Easy to use, simple affordable
Features are all most DIYers will need, would like to see a crank test in motorcycle mode. Functionality is good, everything seems to work spot on to what I expected and accurate. Ease of use is right on the money, buttons have an obvious feel and audible click to them. No battery, must be plugged in with the usb cord or hooked to a battery. USB offers upload and print features. As far as value for the money, I’d say that depends on the user, it’s in an acceptable range for most. The unit has a really bright backlight or interior light? As you can see in the pictures, seems excessive especially at night. Build quality seems toyish, the backlight, the weight and feel seems like it may not last in a mechanics environment for long. The clips seem ok, but on the small side for what I prefer like clips designed for a hobbyist.
J**T
Great DIY Battery Tester!
This is a great tool to have in your bag to quickly diagnose the state of your battery which I have used on multiples cars. Quality battery clamps with alligator teeth on one side for good grip and a good length cable. There is even a quick test button, one click to instantly get a reading on your battery. This is super handy to grab a quick state of health on your battery and the feature I use most of the time. The display is very bright and easy to read at most angles. In addition it has an LED indicator for a quick visual of Good (green), Charge (yellow), or Poor (red). In addition you can go into the vehicle mode to do additional tests such as Battery test, Cranking test, and Charging test. Just follow the steps on the screen and it easily walks you through the process. The Battery test will give you detailed information on the State of health as well as the State of charge. In addition it will show you current voltage as well as the cold cranking amps compared to the factory standard on your battery. The results are given as to whether the battery is good, good but needs charging, replace, bad cell, or charge retest. Glad I had this tool because it let me know that my truck battery is failing and says replace, which keeps me prepared! The Cranking test will show you detailed data when you crank the car following the prompt but mostly you are looking for Normal or Low for the result. The Charging test is a little hard depending on your battery placement since you have to rev the engine but I was able to do it by myself with one of my cars. I do not have a motor cycle so was not able to test that feature but I am sure it will be helpful to those where that is a part of their fleet. You can do both in vehicle and out is vehicle battery testing which is helpful. The waveform feature gives you a graph display of visual dips in the ignition and charging states as well as offering a quick button for this feature as well. Additional features that come with this device are system screen test and button test as well as a easy to read manual. Provides easy review of recent battery test and wave form data as well as printing the results if maybe you need to give it to a neighbor. Plus it gives you a usb port for updating the software on the unit for feature improvements. Great Tool to prevent you from not being aware of a failing battery and leaving yourself stranded. The is also a Great company with exceptional support and quick to get back to you if you have any issues or need help! Highly recommend!!
S**N
Simple Setup, Clear Results — Great Battery Tester for New and Old Vehicles
I picked up the VDIAGTOOL BT500 to check the health of several vehicles in my garage and found the whole process easy and clear. I used it on three different rigs: a 2009 Toyota (passenger SUV), a 2021 Toyota (offroad SUV), and a 2003 Jeep Wrangler. Across all three, the tester performed exactly as expected. What I liked: The setup was straightforward: clip red to the positive, black to the negative terminal, pick the correct voltage/battery type in the menu, and go. The manual confirms support for 6V/12V/24V batteries and vehicles from motorcycles to trucks. The display is readable — large enough font, intuitive menu system, and it gives a clear verdict rather than making you interpret cryptic numbers. On all cars I tested, the results were clear (all had good batteries and all tests indicated such). Compatibility was excellent, testing all three vehicles with batteries and systems of different vintages. The alternator / charging system function is a nice bonus. The manual explicitly mentions cranking test and charging test in addition to battery load test. Build: It felt solid, the clips had good grip, and the menu/screen felt polished rather than the cheap plastic gimmick that many “budget” testers are. While the menu is intuitive, you still need to select the correct battery type (flooded, AGM, etc) and voltage (6/12/24V) or you may get inaccurate results. The manual emphasizes this. On the older Jeep, the engine bay space was tight and hooking up the clamps required some maneuvering; so even though the unit is easy to use, vehicle access can still slow things down. This tester is designed for 6-24 V lead acid type batteries (flooded, AGM, GEL, EFB) and not for lithium-type or golf cart batteries. If you have a newer EV or a specialist battery, this unit may not be appropriate. Final verdict: If you want a reliable, easy-to-read, and fairly professional battery/charging system tester, the VDIAGTOOL BT500 will work. I used it across cars of different vintage, condition, and complexity—and it performed without hiccups. Because it covers 6V/12V/24V systems it also has good future-proofing (for example trailers, ATVs, etc). Given its versatility and clarity of results, I’m happy with the purchase and would recommend it — just be sure to follow the instructions (select correct battery type/voltage, clamp securely, etc) for best results.
D**L
Very capable battery tester at a reasonable price
As winter is quickly approaching and car batteries are failing, I figured this was a good time to try a new battery tester. I have an old style toaster which does a great job of putting a load on a battery, but the toaster has its limitations. That’s where I found the BT500 is a great addition. I found it easy and intuitive to learn. I also appreciate the printed manual which clearly explains the operational modes. I tested multiple car, motorcycle and marine batteries and I found it to be quite accurate. By sculling through the display you can quickly perform a capacity check, then a cranking test and finally a charging test. Input the capacity of the battery I.e. 700 CCA and start the vehicle and it will show you the result. Another nice feature of the charging test is using the waveform option to monitor charging rates and starting voltage. The test results can also be saved and printed. Finally you can update the software with future upgrades. Over all I found it to be a great addition to my tool box.
E**E
Not user friendly for 6V car batteries
Bought it for the usual 12V test capability but I also have a classic truck with a 6V battery that I wanted to be able to test. It’s listed as a 6V, the box says 6V, but there is nothing in the manual or option screen on the device to test 6V car battery.
N**Y
Il a pas la fonction SBS pour batteries a décharge profondes
Je l'ai acheté pour m'est batteries a décharge profonde de camper power safe SBS 190F et il a pas la fonction que je voulais dessus me prend la fonction SBS ...Stationary batteries service
R**A
Good
Good
P**T
Sehr gut
Sehr übersichtlich, Funktionen selbsterklärend, deutsche Sprache einstellbar.
D**S
Works
Works good
J**N
A bit misleading description
The unit is very well made but..... it says it tests 6-24VDC. It does not. 12/24 only. It will power on at 6 VDC but you cannot test 6VDC batteries. There are no test parameters.
Trustpilot
2 months ago
2 months ago