It means charging veeeeery slow. It’s like filling a large bucket one drop (trickle) of water at a time.
It’s the opposite of fast-charging, which is like filling a large bucket with a high-pressure high-capacity power hose (or a massive waterfall).
Charging very slow takes a long time (duh!) but it’s beneficial because it won’t break the charging device. A bucket filled with drops of water tends to stay intact.
Fast-charging takes a short time (duh!), but it can damage the battery of the device. Filling a bucket with the strongest power hose or biggest waterfall has a risk of breaking the bucket.
Some buckets (batteries) already have leaks on them, so trickle charging is beneficial in keeping the bucket (charge) full without actually charging them (overflowing and damaging the bucket/battery or wasting more water/energy more)
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