Detailed Answer
Oxidized charging contacts: 1. Power off (remove the battery); 2. Wipe with a dry cloth/cotton swab; 3. For heavy oxidation, use an eraser (gentle); 4. Apply a thin layer of conductive grease (optional); 5. Check contact springiness (factory if deformed). Lider cradle contacts are gold-plated (anti-oxidation), but still oxidize over time. Include contact cleaning in monthly maintenance.
| Clean | Eraser |
| Prevention | Conductive grease/gold plating |
| Severe | Factory |
Note:Oxidized contacts prevent charging — clean first before diagnosing a fault.