Polycom SpectraLink 8020 Technical Bulletin page 6

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rendering technical or other advice or service in connection herewith.
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Figure 3
Once the LED next to the battery charging cavity on the charger goes out the
battery pack is fully charged and can be removed by depressing the battery
retaining clip and lifting the battery pack out of the charger.
Improper insertion of the battery pack will result in damage to the battery pack,
handset, dual charger and/or quad charger and constitutes abuse of the product
voiding any remaining warranty.