The ODYSSEY® PortAlyzer™ battery and electrical system tester from EnerSys® enables users to diagnose discharged batteries quickly and precisely without the need to charge them before testing. A patented microload technology allows precision-testing on vehicle battery, starting and charging systems with minimal user interaction. The PortAlyzer™ tester tests flooded lead acid (FLA) and absorbed glass mat (AGM) batteries, individually or in packs in series, parallel or series/parallel.