Steady voltage: in the past, automobile power was somewhat iffy. Voltage fluctuations were common. But in current automobiles, the smartphone car charging system is more stable and reliable. However, you can still get spikes. These can commonly happen when starting the car. The automobile system goes from drawing potentially hundreds of amps from the battery to absorbing a full-on charge from a fired up engine.

One should not be surprised if some voltage spikes or fluctuations get through the power take-off point (cigarette lighter for those of you who still do it). Lesser spikes might happen when large demands are made on the system as when the A/C comes on. Are these spikes and fluctuations harmful to a charging electronic device? Probably not, particularly if the device is well-designed.

Most quality chargers have some kind of smart chip that can measure the input current and detect when the battery (or cell) is fully charged and vary the voltage accordingly to prevent overcharging and eventual burnout. An obvious example is a charger for the car itself. By that I mean a device you plug into 110 volt AC and use to charge the battery in your car. These devices are quite sophisticated and usually come with an instruction manual that explains the process.

So the best I can tell you is to not buy the cheap adapter, and make sure to unplug it when starting the car. That is what I do.

Baseus Quick Car Charger QC 0.1/ 2.0 USB Car Charger + Hands-Free Kit

Portable Fast External Battery Pack Charger Compatible to iPhone 6, iPhone 6S, iPod,Samsung Galaxy, Bluetooth Speaker and more.

Qualcomm Certified, the New QC 2.0 technology offers quick charging for your devices, .
Sleek and compact design, compatible with most USB-enabled devices
Low-profile car charger plugs into any car power outlet compact, quickly charge your iPhone 5/6/6s, Samsung Galaxy S6 / Edge / Plus, Note, Nexus, HTC, Motorola, Nokia and other smart phones, MP3 Players, Digital Cameras and PDAs.
Feature of input:12-24V; Output: DC 5V/12V.
What You Get: 01 Energy Drive Mate car charger, USB charging cable(iPhone cable not included), user manual, warranty card, our fan-favorite 6-month warranty and friendly customer service.

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Aukey 36W USB Car Charger

(Qualcomm Certified Quick Charge 3.0/Quick Charge 2.0-Compatible) for Galaxy S6 / Edge / Plus, Note 5 / 4, Nexus 6, Samsung Fast Charge Qi Wireless Charging Pad and more

Safe & Reliable: Certified RoHS, CE & FCC, Protect devices from overheated and over-currents, overcharging, and short circuits, Charging will automatically stop when the battery is full.

Smart Double-USB Port Design: Intelligently identifies your device for safe charging of Dual devices at full speed simultaneously, （Output: DC5V-3.4A(Max), Output 1: 5.0V /1A, Output 2: 5.0V/ 2.4A）it's perfect fits in the auto vehicle cigarette lighter USB charger spot socket. The best cool tech USB multiport car gadgets for just you or sharing the charge time with a friend.

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USB C Car Charger, 65W 3 Ports Super Fast Car Charger Adapter, PD3.0 & QC3.0 30W Type C Car Charger Compatible with iPhone 15/14/13/12/11, Samsung Galaxy S24 Ultra/S23, Cigarette Lighter USB Charger.

65W multi port charger adapter is equipped with 1 USB C ports and 3 USB A ports. Kids on the back of the car will love it while traveling. Because they won’t have to fight for the problem who can use the cellphone car charger first. Best gifts for your trip.

3X faster than 2.1A charger, charges iPhone 14 Pro max from 0-50% in just 25 minutes. QC 3.0 port output 18W, charges most of android devices from 0% to 60% within 35 minutes.

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Bluetooth V5.0 EDR Handsfree Car Kit FM Transmitter 3.5mm Aux Car Audio MP3 Player QC3.0 Quick Charge with LED Light untuk RM59.99.