If you have a car, you can try this one USB 457W 9 6A1 5m YELLWWORS
It has LED's for "reverse", "charging" and "charged". If the light for reverse is lit, the cables are connected backwards. If the charging light is on, it's charging. If the charged light is on, it's fully charged.
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If you have a car, you can try this one
USB 457W 9 6A1 5m YELLWWORS
It has LED's for "reverse", "charging" and "charged". If the light for reverse is lit, the cables are connected backwards. If the charging light is on, it's charging. If the charged light is on, it's fully charged.