Short answer: A faint, brief ‘new electronics’ smell from off-gassing components is common and not a safety concern; a persistent burning smell, however, is not normal and is a reason to stop using the charger immediately.
What ‘Trickle Charging’ Actually Means and When It Happens
Trickle charging refers to a slow, low-current charging mode used either to safely revive a deeply discharged battery or to…