AmazonBasics B00TS19BUW Manuel De L'utilisateur page 10

3) To protect your charger & batteries
When installing battery for charging, make sure to insert the negative(-) terminal of battery
first, then press the top of battery to connect the positive(+) contact plate. Incorrect
direction to install the battery will cause damage to the negative terminal of the charger and
the battery sleeve.
Correct direction to install the battery
AA batteries
AAA batteries
Incorrect direction to install the battery
AA batteries
AAA batteries
9