How do I know when the battery is ready to start the engine?
The battery is ready to start the engine when Step 4 is lit on the LED display. Step 4 is the Absorption stage, which charges with declining current to maximize up to 100% battery capacity. The battery is fully charged when Step 7 is lit. (Page 2)
From the official Ctek Ctek Mxs 5 0 Battery Charger User manual, page 2
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