Very Confusing - Which car charger to buy - QC3.0 vs Power Delivery vs 3.1Amp ?

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Budhe-Baba

I have Redmi K20.
Another family member has Samsung M30s.


Even after Googling, I was unable to identify which Car Charger will be best & fastest for phones above? QC3.0? USB-PD? Normal 3.1Amp? Normal 2.4Amp? Can anyone help?

@LIMBO @guest_999

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K20 supports qualcomm quick charge 4.0 & up to 18w but not sure if QC 4.0 charger will also work smoothly with M30S which seems to have QC 3.0 support.

Benevolent Benevolent
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Babag hdd se lekar furniture, laptop se lekar charger sab lenge but for fast charging cable sirf 100rs.hi denge Mujhe lag rha ha babag sabse ameer dimer ha
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guest_999 wrote:

K20 supports qualcomm quick charge 4.0 & up to 18w but not sure if QC 4.0 charger will also work smoothly with M30S which seems to have QC 3.0 support.

Yes, all these fragmented companies have created a messed up technology ecosystem in the name of profits. Looks like have to do hit and trial only.

Thank you for your reply.
Deal Cadet Deal Cadet
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Both phones should fast charge with a USB Power Delivery adapter. Quick Charge 3.0 and older has been effectively abandoned so you shouldn't buy a brand new adapter for it in 2022. QC 4 and newer is fully compatible with USB PD.

Samsung's current 25/45W Super Fast Charging tech is just another name for USB PD PPS aka the industry standard but I don't think the M30S supports it. Unfortunately, that means it was one of the last phones with Adaptive Fast Charging. Still, I think it should charge at 15W via USB-PD's 5V 3A or 9V 1.67A profiles.

In short, buy USB Power Delivery (optionally PPS if you can find it), especially if you will upgrade to newer smartphones in the near future. Virtually every device supports USB PD now.

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sharpen wrote:

Both phones should fast charge with a USB Power Delivery adapter. Quick Charge 3.0 and older has been effectively abandoned so you shouldn't buy a brand new adapter for it in 2022. QC 4 and newer is fully compatible with USB PD.

Samsung's current 25/45W Super Fast Charging tech is just another name for USB PD PPS aka the industry standard but I don't think the M30S supports it. Unfortunately, that means it was one of the last phones with Adaptive Fast Charging. Still, I think it should charge at 15W via USB-PD's 5V 3A or 9V 1.67A profiles.

In short, buy USB Power Delivery (optionally PPS if you can find it), especially if you will upgrade to newer smartphones in the near future. Virtually every device supports USB PD now.

Very informative. Thanks and I have Given some Karma to you. Also PMed you a small query.

Benevolent Benevolent
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guest_999 wrote:

K20 supports qualcomm quick charge 4.0 & up to 18w but not sure if QC 4.0 charger will also work smoothly with M30S which seems to have QC 3.0 support.

suppose a phone supports 25w charging. now powerbank or car charger or any charger supports 50w charging or 20w charging.then in both cases it will impact battery of phone? + @getready
Mobile Guru Mobile Guru
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K20   - Quick Charge 4.0 (backwards compatible with QC 3.0/QC 2.0)
M30s
- Samsung Adaptive Fast charging (aka QC 2.0)

There are many car chargers with both USB-PD (via USB Type-C) and QC 3.0/2.0 (via USB 3.0) support

Mobile Guru Mobile Guru
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kukdookoo wrote:
suppose a phone supports 25w charging. now powerbank or car charger or any charger supports 50w charging or 20w charging.then in both cases it will impact battery of phone? + @getready

That 20/25/50w is the max input/output. Both adapters and phones can charge / get charged at various voltage & electric current combos. For better understanding, check the output specs for official charger and compare it with that of third party adapters or power banks. That being said, if you try to charge your phone with an adapter / power bank supporting different fast charging tech, then expect the charging speeds to be too low (10W?)

Refer this post

Deal Cadet Deal Cadet
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why both with faster charging in a car? if you leave your phone connected long enough, map nav etcc.. it will be charged full even before you notice

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noobDealer wrote:

why both with faster charging in a car? if you leave your phone connected long enough, map nav etcc.. it will be charged full even before you notice

My existing car charger charges 1% in 3-4 mins. If I drive for 30 mins, the phone does not even get charged 10%.

Deal Cadet Deal Cadet
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Budhe-Baba wrote:

My existing car charger charges 1% in 3-4 mins. If I drive for 30 mins, the phone does not even get charged 10%.

get your car alternator checked then or maybe you're driving too slow for alternator to kick in
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