Two batteries reduce charging time?

"Spanfeller is a twat" (theaspiringengineer)
11/09/2018 at 19:42 • Filed to: None

Oppo released a new phone that, rather than having one huge battery, it has two.

I wonder if this solution would work for cars as well. I mean, in concept it makes sense as long as you feed the same current to the two batteries...I guess it would require better cooling and more cabling in a car, but it could reduce charge times I suppose.

DISCUSSION (12)

Nibby > Spanfeller is a twat
11/09/2018 at 19:53

Some luxury cars have 2 batteries... one extra to power electronics like powered seats and such.

Ford F series trucks in the 70s-90s had dual gas tanks.

Textured Soy Protein > Spanfeller is a twat
11/09/2018 at 19:53

Boats often have 2 batteries but that’s more for redundancy as they tend to sit around not being used.

OnePlus and Xiaomi are the only Chinese brand phones I’d fuck with, personally. Maaaaybe Huawei but not really.

Jordan and the Slowrunner, Boomer Intensifies > Spanfeller is a twat
11/09/2018 at 19:56

Diesels tend to run 2 batteries, at least the trucks do.

Spanfeller is a twat > Nibby
11/09/2018 at 19:57

Yeah, but gas tanks and batteries work very different, the time it takes to charge a battery increases as the charge goes up.

Spanfeller is a twat > Jordan and the Slowrunner, Boomer Intensifies
11/09/2018 at 19:58

I mean, for electric cars...

Jordan and the Slowrunner, Boomer Intensifies > Spanfeller is a twat
11/09/2018 at 20:04

They tend to run several batteries...

Spanfeller is a twat > Jordan and the Slowrunner, Boomer Intensifies
11/09/2018 at 20:09

I guess so, but the big isssue continues to be the flow without damaging it, no?

TheTurbochargedSquirrel > Spanfeller is a twat
11/09/2018 at 20:09

Oppo has chosen to use two batteries in their phone to reduce the damage to the batteries as a result of fast charging rates. Functionally it works the same as a single battery but it allows for a higher charging rate into the phone for the same increase in battery temperature (theoretically with 2 cells in parallel you could charge at twice the rate with the same increase in cell temperature though in reality the charge rate improvement is slightly less due to both cells being located in close proximity) . This technique is basically essential in electric vehicle design to allow for the high charge and discharge rates the battery pack needs to support without overheating. The current car I am working on with my schools FSAE team uses 80 battery modules, each of which contains 8 cells in parallel. This gives us 8 times the input and output current capabilities as well as 8 times the capacity compared to just having 80 cells in series.

Jordan and the Slowrunner, Boomer Intensifies > Spanfeller is a twat
11/09/2018 at 20:18

No clue.

winterlegacy, here 'till the end > Spanfeller is a twat
11/09/2018 at 20:22

It may just be cheaper to run two batteries in parallel rather than buy one massive capacity one. There may also be some sort of resistance against wear-down, I don’t know - just makes me think that you’re only using a fraction of the battery’s capacity to achieve something like 80% charge through both batteries.

Spanfeller is a twat > TheTurbochargedSquirrel
11/09/2018 at 20:44

Is there a space or weight penalty? If part of the issue is heat I guess there could be a problem

TheTurbochargedSquirrel > Spanfeller is a twat
11/09/2018 at 20:58

There are a couple approaches. The most common is to use more smaller batteries to give you the same capacity as a normal size battery but with increased current capabilities. This is roughly the same size and weight as a normal battery. The other option is to trade size and weight to use more normal size batteries to gain more capacity and current capability. I believe the Oppo uses 2 small batteries to give you the same capacity as a normal phone but with a faster charge rate.