Nissan LEAF 2023 Owners Manual
12.5.1. Battery (Maintenance free battery)
For a maintenance free battery it is not required to check the fluid level. However, NISSAN recommends to visually check the green indicator (A) status periodically. If it is not visible, replace the battery as soon as possible.
If battery replacement or check is required, contact a knowledgeable LEAF repairer such as a NISSAN certified electric vehicle dealer.
Owners Manual