: A flashing light usually indicates charging is in progress; a continuous light signifies the battery is ready. : This unit can act as a simple battery tester
: Unscrew the cell plugs on standard (non-sealed) batteries to let gases escape safely.
If you're interested in learning more about the Bosch KL 1208 manual top, here are some additional resources:
If you meant "Manual Top Up" (adding hydraulic oil): The proper fill procedure is usually located near the hydraulic cylinder. You should use high-quality HLP hydraulic oil. Do not overfill; the oil level should be visible in the sight glass (if equipped) or roughly 10mm below the filler neck when the forks are fully lowered.
: The unit includes electronic protection against short circuits and reverse polarity (connecting terminals to the wrong poles). Critical Usage Guidelines
Suitable for testing batteries with 24–66 Ah capacity; testing batteries outside this range may provide false information.