Official Answer
Please confirm the charger being used is compatible with lithium batteries, you can check using our Charger Compatibility List.
If using a Norsk Lithium Evo-Tec On-Board Charger, ensure you select the correct mode on the charger, Ex: 12V/16V mode, and Lithium mode.
ALWAYS verify charger compatibility before charging.
Answered by Odin
TECH GOD!