Vetus D-LINE VD4.120 Operation Manual page 55

6 Maintenance
19 Battery, battery connections
Keep battery clean and dry.
• Remove battery cables (negative first).
• Clean battery posts (+ and −) and clamps
and grease with acid-free and acid-resistant
grease.
Ensure that clamps make good contact after
reassembling.
• Hand tighten the bolts only.
Battery, cables and connections
Every 100 operating hours.
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