Any jump-starter/battery bank with USB type C PD output? - Page 1
Forum section: electronics / general

author: zapta
author_rank: Super Contributor
timestamp: November 23, 2023, 07:58:02 am
content: I ordered this jump-starter/battery-bank from Amazon and then realized that the USB Type C doesn't support PD and 20V. Anybody knows of a similar product that output USB Type C PD? This will be useful for charging my Mac computer on the move, in addition to jump starting cars.https://www.amazon.com/dp/B09HJH1S41

author: Berni
author_rank: Super Contributor
timestamp: November 23, 2023, 08:09:05 am
content: Since it looks like it uses a standard battery connector that is used in RC models, you could just make one yourself.Get a 12V cigarette charger with the desired capability, then modify it to have a cable coming out of it with the same connector to plug into the 12V output of that battery bank.You will have a hard time finding a 20V USB-PD built in. The internal architecture can become more complicated at such powers (hence more expensive). So it is pretty rare to see 20V capability even on purposely built USB battery banks, even more rare to see one that does 20V at 5A. Not to say they don't exist, but they are significantly more expensive.

author: zapta
author_rank: Super Contributor
timestamp: November 23, 2023, 08:26:48 am
content: It did come with an adapter that makes it a cigarette lighter socket with 15V/10A output.

author: Berni
author_rank: Super Contributor
timestamp: November 23, 2023, 08:44:18 am
content: Then you can simply use that with a cigarette USB charger adapter for an off the shelf solution.Tho don't have too high expectations for the battery capacity in these things. Not only do the Chinese products like to specify a large fake capacity, but these super high discharge rate lithium cells also have a significantly lower energy density. So as a result don't expect one of these to be able to fully recharge a laptop from 0 to 100% unless it is one of the lower power thin and light laptops.

author: zapta
author_rank: Super Contributor
timestamp: November 23, 2023, 07:25:28 pm
content: Barely charging one time? It's heavy hand have about 90WH. Are those Macbook pro laptops so power hungry?

author: Someone
author_rank: Super Contributor
timestamp: November 23, 2023, 08:54:23 pm
content: Quote from: zapta on November 23, 2023, 07:25:28 pmWhere do you get that figure from? the item you linked to advertises something on the order of 60Wh which would only partially charge many laptops.

author: Berni
author_rank: Super Contributor
timestamp: November 24, 2023, 06:16:02 am
content: Not sure where you got those numbers. The listing doesn't really specify the Wh but it does say it can charge a iPhone 12 up to 6 times. So since that phone has a 10Wh battery that would give about 60Wh. And that has to be taken with a grain of salt since i always see the Chinese claim battery banks to have more capacity than they actually do. For that reason i measure my battery banks on an electronic load to see what they actually hold and write that into the bank so that i know how much energy i actually have in there.Then for example a 2019 MacBook Pro has a 100Wh battery. So once you factor in the efficiency losses of multiple DC/DC converters along the chain you would be lucky to get it charged to 50%

author: Rick Law
author_rank: Super Contributor
timestamp: November 24, 2023, 10:00:02 pm
content: The Watt-Hour number can be deceiving when compared to actual practical capacity.I've found battery manufacturers has a tendency to list the most favorable number. Also -- the battery has it's own tendency that the higher the current drawn, the less total WH it can deliver. If it could do 60WH at 0.5Amp current drawn, typically it would be a lot less WH at 2Amp and even less at 3Amp... The combination of battery tendency and manufacturer tendency is of course going to make things a lot worst. The manufacturer find the best case to put on their advertisement. But to use it, you will be using it at a current demand much closer to worst case than you would like.I bet to charge that phone 6 times, they limited the charge current down already. Presumably, the laptop would be more demanding more than the phone at regular charge rate, so without lowering the charge current (= slowing the charge rate), you would not get a one-to-one comparasion.

author: NiHaoMike
author_rank: Super Contributor
timestamp: November 24, 2023, 11:54:24 pm
content: Quote from: Rick Law on November 24, 2023, 10:00:02 pmFor a battery that can output well over 100A (even if only for a few seconds), the internal resistance losses would be almost zero at a few amps.

author: zapta
author_rank: Super Contributor
timestamp: November 25, 2023, 06:28:46 am
content: https://us.gooloo.com/products/gp4000-jump-starter-1?variant=4246301465005288.8WH

author: zapta
author_rank: Super Contributor
timestamp: November 25, 2023, 06:29:45 am
content: Quote from: Berni on November 24, 2023, 06:16:02 amFrom herehttps://us.gooloo.com/products/gp4000-jump-starter-1?variant=4246301465005288.8wh