Optimate TS120 Battery / Alternator Tester

The Optimate TS120 Battery / Alternator Tester helps you check the condition of your 12V lead-acid or 12.8V LiFePO4 starter battery and confirm alternator output during engine running. You use the built-in LED indicators, automatic voltage recording, and wide testing range to assess charge level, cranking voltage and charging voltage with quick on-vehicle checks.Discover the key features of this tester:State of Charge LED Display: A fully enclosed electronic LED panel presents green and red indicators that show battery charge status by monitoring open-circuit voltage, helping you identify a weak battery before you start the engine and allowing you to act early to prevent starting issues.Cranking Voltage Recording: An automatic voltage-logging function measures and stores the lowest cranking voltage for 20 seconds using internal circuitry calibrated to read down to 6V, giving you accurate insight into the battery s starting performance and helping you diagnose voltage drop problems that affect engine turnover.Charging System Voltage Range: A monitoring circuit measures alternator and regulator output up to 15V through the SAE connector and test leads, giving you a clear view of charge levels during engine running and helping you detect under- or over-charging that can lead to reduced battery lifespan or damage.SAE Connection Options: A 2-pin SAE input with supplied battery clips and 100cm SPT-2W 16 AWG cabling lets you connect directly to the battery or to an installed SAE lead, supporting straightforward checks and making it easier for you to test the system in different setups.You use this tester to track how your battery performs from cranking to charging, giving you a clearer understanding of whether your vehicle is starting and charging as it should. The automatic operation and LED feedback support quick checks when you need simple confirmation of battery or alternator condition. It is a practical addition to your tool kit when you want a straightforward way to monitor electrical performance and keep your vehicle starting reliably.