150W 20A Battery Capacity & DC USB Electronic Load Tester

150W 20A Battery Capacity & DC USB Tester with PC App

- accurately test lithium batteries, DC power supplies and USB-powered devices with a stable, configurable electronic load. Designed for users who need clear, repeatable measurements and digital logging, this 4‑wire tester supports multiple test modes and computer connectivity for detailed analysis.

This tester provides a constant, controllable load up to 150W and 20A, with a 4‑wire (Kelvin) connection that helps reduce lead resistance error for more reliable voltage and capacity readings. It supports test voltages from 2-200V DC and is suitable for checking lithium battery packs, DC power adapters, bench power supplies and USB outputs. The integrated lithium discharge monitor tracks real capacity during controlled discharge, helping you evaluate battery health and performance over time.

The unit offers four operating modes: constant current (CC), constant resistance (CR), constant power (CP) and constant voltage (CV). Built‑in protection includes overload, overcurrent and over‑temperature safeguards, with automatic limiting based on voltage range (up to 150W below 36V, 60W between 36-80V, and 45W between 80-200V). A color display and straightforward interface make it easier to set parameters, start/stop tests and view key data at a glance. Background settings allow you to switch between Chinese and English by long‑pressing the Start button and using the +/- keys.

For extended analysis, the tester connects via Bluetooth and PC cable to dedicated software (Windows 7/10+ and Android 5.0+; iOS via the E_test app). The PC and mobile apps display curves, log measurements and help you identify instability, voltage drop, or capacity loss. Connection modes include _BLE for mobile devices and _SPP for PC, with pairing passwords of "0000" or "1234" where required. Please note: the included DC12V 1A power supply is US standard with a US‑to‑EU adapter; if your region cannot use this supply, you will need a compatible local 12V 1A adapter.

Why It's a Smart Choice

• 4‑wire measurement and multiple load modes support more precise, flexible testing of batteries and DC supplies.
• PC and mobile app connectivity enable real‑time curves, logging and easier diagnostics of faults or inefficiencies.
• Integrated protections and clear operating limits help protect both the tester and connected equipment during use.

FAQ

Q: What voltage and power ranges can this tester handle safely?
A: The tester supports 2-200V DC. Maximum power is 150W below 36V, 60W between 36-80V and 45W between 80-200V. Always set current and power within these limits.

Q: Which operating modes are available?
A: The device supports constant current (CC), constant resistance (CR), constant power (CP) and constant voltage (CV) modes for different test scenarios.

Q: What systems are supported by the software and apps?
A: PC software supports Windows 7 and Windows 10 or later. The Android app requires Android 5.0 or above. The iOS app can be found by searching "E_test" in the App Store.

Q: How do I connect via Bluetooth?
A: On mobile, open the E_test app and select the Bluetooth name ending in _BLE. On PC, use the _SPP name. Do not pair through the system Bluetooth menu; connect directly from within the app.

Q: What if the mobile app shows a blank screen or no _BLE signal?
A: Enable GPS/location and storage permissions for the app in your phone settings, then reopen the app and refresh the device list.

Q: What is included in the package?
A: Package contents include the DL24 150W color display Bluetooth load tester, DC12V 1A power supply, PC connection cable, temperature probe, red/black crocodile clip leads and a US‑to‑EU adapter.