The Telwin STS700 is a digital battery tester designed for comprehensive analysis of 12V batteries with capacities ranging from 8 to 240 Ah. This intelligent diagnostic tool assesses the battery's charge status while simultaneously testing the vehicle's starting and charging systems, including alternator performance. The device features a data storage function for test results and supports printing capabilities when connected to a computer, allowing for detailed analyses through voltage-time diagrams. With compact dimensions of 8.0 x 2.3 x 15.0 cm and a lightweight of 0.27 kg, the tester is particularly portable and practical for automotive applications. The STS700 operates without disconnecting the battery from the vehicle, enabling quick and efficient testing procedures. It supports all common 12V lead-acid battery types including WET, GEL, AGM, MF, PbCa, and EFB configurations. The device is equipped with a color display and multilingual support for English, Italian, French, German, Spanish, Russian, Portuguese, Dutch, Polish, Japanese, Chinese, and Korean. Testing capabilities include several international standards such as 185/1125-EN A, 100/1400-IEC-DIN A, 26A17/245H2-JIS A, 200/2000-SAE A, 100/2000-CA(MCA)-CCA-BCI, 12N5.5-4A, and 12N5.5A-3B specifications. This professional diagnostic tool provides reliable assessments of battery capacity, starting system performance, and charging system functionality for automotive maintenance and troubleshooting applications.