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What are the reasons for slow charging with a car charger?

3 Answers

VonMicah

07/29/25 6:40am

Low output current of the car charger itself. Here are the specific details: 1. Concept: A car charger refers to a conventional charger powered by the car battery, widely used in the charging of lithium batteries for various portable and handheld devices. The car charger must consider the actual needs of lithium battery charging. 2. Features: Multi-functionality, portability, fashionability, and safety. With the development of the automotive industry, car chargers have been widely applied, showcasing features of multi-functionality, portability, and fashionability. 3. Portability: Portability is a major trend in the development of electronic products today. A unique foldable car charger design is adopted, reducing the product size to 6.9×5.6×3.1cm.

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StEvelyn

08/12/25 10:33pm

Yesterday I just finished a long trip and encountered the same issue. Found several main pitfalls causing slow car charging: First, aging cigarette lighter socket leads to poor contact and unstable voltage; second, many cheap chargers exaggerate power ratings, claiming 18W but actually delivering less than 10W; then there's the data cable issue - my car's cable looked fine but current meter showed excessive resistance. Another easily overlooked factor - charging while using navigation with screen on, music playback and dashcam running in background makes power consumption exceed input. Recommended solution: clean socket contacts with alcohol swabs first, then choose a PD fast-charge compatible charger (preferably with original short cable). Best to close power-hungry apps while charging. If problem persists, vehicle circuit inspection is needed.

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Mitch

10/04/25 4:02am

Last week, while driving my kid to cram school, I was complaining about slow charging. The common reasons fall into three categories: choosing the wrong charging equipment (many people buy those 9.9-yuan free-shipping ones, which are definitely slow); harsh in-car conditions (high temperatures after summer sun exposure cause the charging chip to throttle); and insufficient vehicle power supply (older cars’ cigarette lighter ports can’t keep up with today’s fast-charging demands). The solution is simple: first, switch to a 30W+ dual-port fast charger—avoid cheap knockoffs and pick one with temperature protection. When charging, avoid leaving your phone on the dashboard under direct sunlight; mounting a phone holder near the AC vent is the smartest move. For older cars, consider installing an expansion hub with voltage display for real-time monitoring.

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