The phone that dies at two o'clock is the one running your whole day.
Verdict
Buy the car charger first, then the power bank. You are in the car between every appointment, and a proper USB-C fast charger puts a meaningful charge in during a fifteen minute drive, which handles most days for about twenty dollars. The power bank matters for the day you are on foot at an open house for four hours with a tablet, a hotspot and a phone that is also your camera. Both together cost under seventy dollars and remove a recurring failure.
~$40
Check Anker 20,000mAh 45W Power Bank Price| Anker 20,000mAh 45W Power Bank | Anker 323 52.5W USB-C Car Charger | |
|---|---|---|
| Works away from the car | Yes | No |
| Charging speed | Fast, 45W | Fast, 30W on one port |
| Charges a laptop or tablet | Yes | Tablet yes, laptop limited |
| Needs remembering to recharge | Yes | No |
| Weight to carry | Around a pound | None |
| Price | Around forty dollars | Around twenty dollars |
You spend hours away from the car: open houses, walking a lot, showings on foot in a dense neighbourhood. A 20,000mAh bank refills a phone three or four times and can keep a tablet alive through an afternoon of sign-ins. Its one weakness is that it only works if you remembered to charge it, which is why it is the second purchase and not the first.
Check Anker 20,000mAh 45W Power Bank on Amazon
You want the thing that works without any discipline. A car charger sits in the socket permanently and tops up the phone on every drive between appointments, and the drives are frequent enough that most agents never actually run flat. Get one with USB-C Power Delivery rather than an old style USB-A brick, because the speed difference over a short drive is the entire point.
Check Anker 323 52.5W USB-C Car Charger on Amazon
Modern phones manage charging themselves and taper the rate as they fill, so a good quality fast charger is fine. Heat is the real enemy of battery life, which is a reason not to leave a phone in direct sun on the dashboard while it charges.
Around 20,000mAh is the practical ceiling for most people, since it charges a phone several times and still fits in a bag. Larger units are heavy and some exceed airline carry on limits, which are set by watt hours rather than by mAh.
If you are navigating between showings all day, a magnetic mount that charges while it holds the phone removes a step and keeps the screen visible. It charges more slowly than a cable and generates more heat, which is a fair trade for the convenience.
Comparison based on published manufacturer specifications and the general consensus of owner reports. We have not tested these units side by side. Confirm current prices and specifications before buying. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.