10 Best Battery Load Testers 2025 in the United States

The FOXWELL BT705 Car Battery Tester is a versatile tool designed for both professional and DIY use. It supports 12V and 24V batteries, making it suitable for a wide range of vehicles, including cars, trucks, motorcycles, and boats.

One of its key strengths is the extensive load capacity range of 100-2000 CCA, which covers various battery types such as flooded, AGM, spiral, and GEL batteries. The tester provides comprehensive diagnostics, including battery health (SOH), state of charge (SOC), cranking voltage, and alternator performance, which can help prevent unforeseen breakdowns and reduce maintenance costs.

The FOXWELL NT301 Plus 2-in-1 OBD2 Scanner Battery Tester is a versatile tool designed for vehicle owners and mechanics. This device combines the functionality of an OBD2 scanner and a battery tester, making it an efficient tool for diagnosing engine issues and checking battery health. It supports a voltage range suitable for 12V batteries and offers a load capacity of 100-1100CCA, which covers a wide range of battery types including AGM flat, AGM, and GEL.

The 2.8-inch TFT color screen provides clear and easy-to-read results, ensuring users can quickly interpret the data. Portability is a plus, with its compact dimensions (3.7 x 1.26 x 5.71 inches) and lightweight design (1.32 pounds), making it easy to handle and store. Additional features include live data display, lifetime updates via Windows, and compatibility with major OBD2 protocols for vehicles from 1996 onwards.

Though it does not support mobile apps, service light resets, or diagnostics for non-engine systems such as ABS or airbags, it’s an excellent choice for routine diagnostics and battery health checks. Special protocols may require extra connectors, and some vehicles may not support Auto VIN detection, requiring manual entry. Users should be aware of its limitations in broader vehicle diagnostics.

The TOPDON BT100 Car Battery Tester is a solid choice for anyone needing to assess the health and performance of 12V lead-acid batteries. With a load capacity suitable for batteries rated between 100-2000 CCA, this tester works well for various vehicles including cars, trucks, motorcycles, and even boats. One of its strengths is the comprehensive testing capabilities; it can evaluate battery health, cranking power, and charging systems, providing users with essential information for vehicle maintenance.

Portability is another highlight of the BT100, as its compact design makes it easy to store in a glove box or center console. The user-friendly interface with color-coded LEDs simplifies the testing process, making it accessible even for those who are not tech-savvy. Additionally, the device is built with safety features like reverse polarity protection and spark prevention, which adds to its reliability during use.

It’s important to note that this tester is limited to 12V batteries, so if you need a device that can handle different voltage systems, you might want to consider other options. Also, while the passive testing function is a safety benefit, it does mean that users need to connect the device properly to perform any tests, which could be a slight inconvenience for some.