---
product_id: 216009583
title: "KONNWEI KW650 6V 12V Car Battery Tester, 100-2000 CCA Battery Load Tester Automotive Battery and Alternator Tester for Vehicles/Marine/Motorcycle/Lawn Mover"
brand: "konnwei"
price: "$106.45"
currency: USD
in_stock: true
reviews_count: 12
category: "Konnwei"
url: https://www.desertcart.us/products/216009583-konnwei-kw650-6v-12v-car-battery-tester-100-2000-cca
store_origin: US
region: United States of America
---

# 100-2000 CCA load testing range >99.5% testing accuracy 6V & 12V battery compatibility KONNWEI KW650 6V 12V Car Battery Tester, 100-2000 CCA Battery Load Tester Automotive Battery and Alternator Tester for Vehicles/Marine/Motorcycle/Lawn Mover

**Brand:** konnwei
**Price:** $106.45
**Availability:** ✅ In Stock

## Summary

> 🔧 Diagnose smarter, drive worry-free — the KW650 keeps your power game strong!

## Quick Answers

- **What is this?** KONNWEI KW650 6V 12V Car Battery Tester, 100-2000 CCA Battery Load Tester Automotive Battery and Alternator Tester for Vehicles/Marine/Motorcycle/Lawn Mover by konnwei
- **How much does it cost?** $106.45 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/216009583-konnwei-kw650-6v-12v-car-battery-tester-100-2000-cca)

## Best For

- konnwei enthusiasts

## Why This Product

- Trusted konnwei brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision You Can Trust:** Powered by STM32 chip delivering lightning-fast results with over 99.5% accuracy in milliseconds.
- • **Future-Proof with Updates:** Supports online software updates ensuring your tester stays cutting-edge and ready for new tech.
- • **Waveform Voltage Analysis:** Exclusive one-key real-time voltage waveform tracking to diagnose battery & alternator health like a pro.
- • **Comprehensive System Testing:** Beyond batteries—checks starter cranking & alternator charging to prevent unexpected breakdowns.
- • **Universal Battery Compatibility:** Tests all 6V & 12V batteries including AGM, gel & flooded types for versatile vehicle coverage.

## Overview

The KONNWEI KW650 is a professional-grade 6V/12V automotive battery and alternator tester supporting 100-2000 CCA batteries including AGM, gel, and flooded types. Featuring a high-precision STM32 chip, it delivers over 99.5% accurate results within milliseconds. Its unique voltage waveform analysis and starter/alternator testing capabilities provide comprehensive diagnostics for cars, boats, motorcycles, and lawn equipment. With an intuitive color display, multi-language support, and online update functionality, the KW650 is designed for both DIY enthusiasts and professional garages to prevent battery failures and optimize vehicle performance.

## Description

Product description KW650 Battery Load Tester Key Features 2. Test Multiple Battery Types: regular flooded, AGM flat plate, AGM spiral and gel; 3. Color screen , support both in-vehicle and out-of-vehicle test , no need to remove the battery; 4. Test Standards: CCA, BCI, CA, MCA, JIS, DIN, IEC, EN, SAE and GB; 6. Provide reliable results within seconds , display suggestion according to the testing results (Good, Recharge, Replace), detects bad cells directly; 7. Polarity reverses connection protection; reminder light 8. Support 12 languages: English, Russian, French, Spanish, German, Italian, Portuguese, Dutch, etc. 9. Print data & Lifetime free update service; 10. Suitable for automobile factory, garage, auto battery manufacturer, and DIY enthusiasts, etc. Why do you need to know battery conditions (Good or replace)? WARNING - The battery cca tester never discharges or drain the battery. - If there are abnormal test results, maybe your battery is overcharged or incompletely charged. So, the battery will be damaged or its life will be greatly shortened, then you can take action to deal with this issue. Know the battery status in advance to prevent the annoying battery failure situations. Plug and play--input the rated battery capacity, KW650 will start analyzing the battery's CCA value, charge (%), voltage (v), internal resistance (Ω), rated CCA, battery healthy (%) and display the test result on screen within seconds. Provide 5 kinds of professional advice accordingly GOOD BATTERY: The battery is without any problem, use it without worries! GOOD, RECHARGE: Good battery but low current, recharge before using. REPLACE: The battery is already or near to reach the end of the using life, please replace the battery. BAD CELL, REPLACE: Battery interior damaged, bad cell or short circuit, replace the battery. CHARGE-RETEST: Unstable battery shall be recharged and retested to avoid error. WIDE TESTING RANGE KW650 can test all the 6 volts and 12 volts batteries, wide operating range all the way down to 100 cold-cranking amps and as high as 2000 cold-cranking amps. CONVENIENT TESTING SITUATION No matter the batteries in the vehicles or out of the vehicles, KW650 will finish its testing job excellently, pocketed size let you can bring it to anywhere you want. TEST MULITPLE BATTERY TYPES KW650 is designed to test most battery types: Conventional Flooded Acid, AGM Flat Plate, AGM Spiral Wound and Gel Cell batteries and so on. DISPLAY VOLTAGE IN GRAPH Displayed voltage readings in a chart to better analyzing the status of your car battery! You could playback the waveform in tester or upload to computer for more precise analysis. FAST & ACCURATE RESULTS With the best STM-32 main chip, KONNWEI KW210 12V automotive battery analyzer testing speed is much faster than others, also provide more accurate and reliable results. High precision amplifier which calibrated by professional instruments, giving you more precise reports within seconds! COLOR SCREEN & REMINDER LIGHT No like other battery testers which made of a backlit screen, KW650 has an HD color screen, easy to read also eye protection. The unique remind light is also a great function that helps you know your battery better. UPDATE&PRINT Electronic products must-needed function! The battery tester will never out of date through the update function, we will keep developing the newer software to ensure the accuracy and customer's experience.

Review: Fast and accurate, nice user interface, love the software update feature - I've been having some doubts about my fairly new car battery (Interstate, 700CCA) recently and wanted to make sure I test it before taking it back to the store. I am aware that batteries will lose charge if the car is not used for extended periods of time (which is my case due to WFM for months), but I was thinking that it would take much longer to a new battery to get there, maybe at least 1-1.5 months, especially in nice weather. I have been driving my car about every couple weeks or so, but mainly short drives. I thought that maybe the battery I picked did not quite happen to be the pride of Interstate product quality. Since I've wanted to own one of these battery testers for a while now, I figured that this situation would be a good time to get one, so after looking through several models to get familiar with the common feature set offer vs. cost, I settled to this Konnwei KW650, even though I was a bit reticent about the brand unknown to me. There are a bunch of these testers available, many of them offering similar if not identical feature package, even though the prices differ a lot in some cases, but the reasons that made me go for this one were the nicer processing speed and display, car starting voltage waveform capture and the software update capability. I figured that my risk would be minimal considering all the good reviews and desertcart's easy return policy. Well, I must say that I am very happy with my choice; this one is a keeper. After updating the software as soon as I received it, which was pretty easy to do BTW, I checked my battery and found that even though it was in a pretty badly discharged state, the tester showed that the battery was in very good condition and just needed a good charge. The state of health was 100% and the state of charge was shown to be only 10%. I have also tested a known weak battery I had stored until I can find the time to dispose of it. I tested it both before and after charging it, and in both cases it indicated a very low state of health and prompted replacement. I was planning to rent a professional battery tester and check the full instrument accuracy for parameters like the battery resistance, SOH, SOC, but at least from what I am seeing so far from my tests (lead-acid battery only) everything makes sense. The voltage measurement had only a small accuracy deviation of 0.06-0.1 max over a wide measurement range when verified against a professional meter, but that is meaningless for the purpose of this tester. The voltage ripple was also slightly off, but you can see some of that even when comparing more expensive equipment. The min/max voltage captures during engine start were also reasonably accurate. Considering the cost and intended purpose of the device, I believe that it is more than adequate for the job, and in my opinion, paying any more for a known brand would not be justified from the performance stand point. At least not for my home garage use. In terms of workmanship, I have nothing to object: It comes in a nicely looking plastic case, light weight and just the right size to hold with one hand, clear color graphic display with an easy and intuitive user interface. It has thick yet reasonably flexible 38 inch cable to protect the 4-wire Kelvin test leads, with solid connections to the battery connection clamps. I wish the cable were just a bit longer to reach the vehicle cabin when performing some of the tests more comfortably from the inside, like the car charging system. Not a deal breaker, because these tests are still easy to accomplish, but it would have been more comfortable that way. Now the one feature I was hoping to have on this device, was to be able to factor in the battery temperature into the CCA measurement and SOC calculation, as temperature is a huge factor in battery performance. Again, not a deal breaker at this price for me, but since most higher end devices can compensate for temperature, I believe that it would be a great feature addition and a cheap way to gain an edge over the competition. I wouldn't expect the addition of a battery post temp probe/sensor (although I would actually pay for the cost difference) but at least by manually entering the batt. temperature during battery test setup. Since the software can be updated online, I am hoping that this feature can be added later, and perhaps along with some other good things in the future. Who knows, maybe Konnwei is listening.
Review: Price is right and it works - Seems to work fine. Uncomplicated for one with very limited mechanical skills. Recommended by a friend who taught auto shop at a community college.

## Features

- 【6 & 12 Volts Battery Tester】 As the upgraded version of KW600, KW650 can test all 6V and 12V 100-2000CCA batteries including regular flooded, AGM flat plate, AGM spiral, or gel batteries. The perfect automotive battery testers to diagnose the batteries of car, boat, lawn mowers, etc. Perfect household tool and present for daily use! NEW REPLACEMENT AVAILABLE FOR ANY QUALITY ISSUE.
- 【One-key Waveform Analysis】The exclusive function on KW650 battery analyzer is the voltage waveform analysis, for the beginners, it helps to track the real-time voltage changing to find the battery issue, for the professional repair store, it’s continuous voltage monitoring results can be uploaded to computer then compare it to achieve the analysis of in-car systems.
- 【 >99.5% Accuracy】Thanks to KW650’s powerful STM-32 chip, it provides more than 99.5% precise testing reports within milliseconds, greatly improved the testing speed compared to other battery testers. Besides KW650 is one of the few automotive battery and alternator testers that supports UPDATE function.
- 【Display Overall Batteries Data】Except give you the basic battery parameters such as voltage, internal resistance, cold cranking amp, battery health and charge status, KW650 load tester will also give professional advice based on these data then you can decide whether to replace or charge the battery, help you know battery status in advance to prevent possible battery failures.
- 【Starter& Alternator Tester】KW650 is not only a great battery load tester that tests batteries cranking & charging system but also can test alternator's charging and starter's cranking conditions. And it can switch up to 12 languages for different needs.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B088CP8VPC |
| Best Sellers Rank | #419,570 in Automotive ( See Top 100 in Automotive ) #281 in Battery Testers |
| Brand | KONNWEI |
| Brand Name | KONNWEI |
| Color | KW650 |
| Customer Reviews | 4.5 out of 5 stars 509 Reviews |
| Included Components | STM32 |
| Item Dimensions | 0.79 x 2.76 x 4.92 inches |
| Item dimensions L x W x H | 0.79 x 2.76 x 4.92 inches |
| Manufacturer | KONNWEI |
| Measurement Type | Voltmeter, Ammeter |
| Min. Operating Voltage | 8 Volts |
| Minimum Operating Voltage | 8 Volts |
| Model | KW650 |
| Part Number | KW650 |
| Power Source | Battery Powered |
| Specification Met | [Cautious] Shenzhen Jiawei Hengxin Technology Co., Ltd. Internal Certifications Or Quality Standards |
| Style | Voltage Tester |
| Style Name | Voltage Tester |
| Upper Temperature Rating | 70 Degrees Celsius |

## Product Details

- **Brand:** KONNWEI
- **Color:** KW650
- **Item dimensions L x W x H:** 0.79 x 2.76 x 4.92 inches
- **Power Source:** Battery Powered
- **Style:** Voltage Tester

## Images

![KONNWEI KW650 6V 12V Car Battery Tester, 100-2000 CCA Battery Load Tester Automotive Battery and Alternator Tester for Vehicles/Marine/Motorcycle/Lawn Mover - Image 1](https://m.media-amazon.com/images/I/61bSGT6eseS.jpg)
![KONNWEI KW650 6V 12V Car Battery Tester, 100-2000 CCA Battery Load Tester Automotive Battery and Alternator Tester for Vehicles/Marine/Motorcycle/Lawn Mover - Image 2](https://m.media-amazon.com/images/I/613apOMxy5L.jpg)
![KONNWEI KW650 6V 12V Car Battery Tester, 100-2000 CCA Battery Load Tester Automotive Battery and Alternator Tester for Vehicles/Marine/Motorcycle/Lawn Mover - Image 3](https://m.media-amazon.com/images/I/71lHyuk6UcL.jpg)
![KONNWEI KW650 6V 12V Car Battery Tester, 100-2000 CCA Battery Load Tester Automotive Battery and Alternator Tester for Vehicles/Marine/Motorcycle/Lawn Mover - Image 4](https://m.media-amazon.com/images/I/71F9Qf9RPoL.jpg)
![KONNWEI KW650 6V 12V Car Battery Tester, 100-2000 CCA Battery Load Tester Automotive Battery and Alternator Tester for Vehicles/Marine/Motorcycle/Lawn Mover - Image 5](https://m.media-amazon.com/images/I/61xGIUUspyL.jpg)

## Available Options

This product comes in different **Color** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fast and accurate, nice user interface, love the software update feature
*by L***M on November 9, 2020*

I've been having some doubts about my fairly new car battery (Interstate, 700CCA) recently and wanted to make sure I test it before taking it back to the store. I am aware that batteries will lose charge if the car is not used for extended periods of time (which is my case due to WFM for months), but I was thinking that it would take much longer to a new battery to get there, maybe at least 1-1.5 months, especially in nice weather. I have been driving my car about every couple weeks or so, but mainly short drives. I thought that maybe the battery I picked did not quite happen to be the pride of Interstate product quality. Since I've wanted to own one of these battery testers for a while now, I figured that this situation would be a good time to get one, so after looking through several models to get familiar with the common feature set offer vs. cost, I settled to this Konnwei KW650, even though I was a bit reticent about the brand unknown to me. There are a bunch of these testers available, many of them offering similar if not identical feature package, even though the prices differ a lot in some cases, but the reasons that made me go for this one were the nicer processing speed and display, car starting voltage waveform capture and the software update capability. I figured that my risk would be minimal considering all the good reviews and Amazon's easy return policy. Well, I must say that I am very happy with my choice; this one is a keeper. After updating the software as soon as I received it, which was pretty easy to do BTW, I checked my battery and found that even though it was in a pretty badly discharged state, the tester showed that the battery was in very good condition and just needed a good charge. The state of health was 100% and the state of charge was shown to be only 10%. I have also tested a known weak battery I had stored until I can find the time to dispose of it. I tested it both before and after charging it, and in both cases it indicated a very low state of health and prompted replacement. I was planning to rent a professional battery tester and check the full instrument accuracy for parameters like the battery resistance, SOH, SOC, but at least from what I am seeing so far from my tests (lead-acid battery only) everything makes sense. The voltage measurement had only a small accuracy deviation of 0.06-0.1 max over a wide measurement range when verified against a professional meter, but that is meaningless for the purpose of this tester. The voltage ripple was also slightly off, but you can see some of that even when comparing more expensive equipment. The min/max voltage captures during engine start were also reasonably accurate. Considering the cost and intended purpose of the device, I believe that it is more than adequate for the job, and in my opinion, paying any more for a known brand would not be justified from the performance stand point. At least not for my home garage use. In terms of workmanship, I have nothing to object: It comes in a nicely looking plastic case, light weight and just the right size to hold with one hand, clear color graphic display with an easy and intuitive user interface. It has thick yet reasonably flexible 38 inch cable to protect the 4-wire Kelvin test leads, with solid connections to the battery connection clamps. I wish the cable were just a bit longer to reach the vehicle cabin when performing some of the tests more comfortably from the inside, like the car charging system. Not a deal breaker, because these tests are still easy to accomplish, but it would have been more comfortable that way. Now the one feature I was hoping to have on this device, was to be able to factor in the battery temperature into the CCA measurement and SOC calculation, as temperature is a huge factor in battery performance. Again, not a deal breaker at this price for me, but since most higher end devices can compensate for temperature, I believe that it would be a great feature addition and a cheap way to gain an edge over the competition. I wouldn't expect the addition of a battery post temp probe/sensor (although I would actually pay for the cost difference) but at least by manually entering the batt. temperature during battery test setup. Since the software can be updated online, I am hoping that this feature can be added later, and perhaps along with some other good things in the future. Who knows, maybe Konnwei is listening.

### ⭐⭐⭐⭐⭐ Price is right and it works
*by A***R on February 27, 2026*

Seems to work fine. Uncomplicated for one with very limited mechanical skills. Recommended by a friend who taught auto shop at a community college.

### ⭐⭐⭐⭐ Great device
*by D***T on April 10, 2024*

Work's great I checked my battery with this device and it was easy to use and it was accurate it showed that I had a bad battery cell when the dealership said I had a good battery I went to Advanced Auto and got a better battery and warranty plus they installed it free. I recommend this device.

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-12*