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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

REDVOLT + REDVOLT travel charger

Hey Brent, that Redvolt case looks great! I've been keeping my shit in Ziplock bags.... This looks much better!
 
Very nice....but what is the capacity of a Redvolt battery? The description in the online store doesn't say :confused1:
 
Pawel Achtel said:
Very nice....but what is the capacity of a Redvolt battery? The description in the online store doesn't say :confused1:
Click to expand...

Pawel, form post #159:

KETCH ROSSi said:
We have seen up to 30 minutes, and as low as 14 minutes, it all depends on resolution, speed, amount of equipment on camera, weather, meaning hot or cold, and we have been in all of it.

For this I was extremely happy that now are in Stock, so we will be traveling with 16 of them, an absolutely fantastic way to shoot super light weight and on the go,
once the battery Pro modules ships, then we will have the best of both worlds... ;)

One thing is that after shooting EPIC all over the place with V local batteries, was a true relief using the REDVOLTS, just open th side handle pop one in and go, stick an other one or two in your pocket and go!!
Click to expand...
 
They're 2500 mAh I'm reliably informed, so they're delivering around 70w to 140w for 15 to 30 minutes based on Ketch's reports. The 14.8v rating sounds like lithium ion polymer cells, nominally 3.7v, which will drop to a typical 3.5v/cell under load, but stay nice and stable through the discharge. The camera demanding up to 4C discharge makes it clear that not just any old li-ion would do at this physical size ;) So good on Red for being adventurous with battery specs as well as everything else.

I'd love to know more about the cells themselves, as most high discharge rate lithium cells will also accept a 2C or greater fast charge - 30 minute charging would be nice.

/battery geek
 
John Marchant said:
They're 2500 mAh I'm reliably informed, so they're delivering around 70w to 140w for 15 to 30 minutes based on Ketch's reports. The 14.8v rating sounds like lithium ion polymer cells, nominally 3.7v, which will drop to a typical 3.5v/cell under load, but stay nice and stable through the discharge. The camera demanding up to 4C discharge makes it clear that not just any old li-ion would do at this physical size ;) So good on Red for being adventurous with battery specs as well as everything else.

I'd love to know more about the cells themselves, as most high discharge rate lithium cells will also accept a 2C or greater fast charge - 30 minute charging would be nice.

/battery geek
Click to expand...

Thanks John, that's what I was after and yes, we all need to be battery geeks. I'd like to know more too. Things like self discharge rate, drop of capacity with number of full and partial cycles, etc...
 
Really wanting info on the quad charger, as it seems the only reasonable option to charge whilst in the field without buying a bunch of travel chargers....

Price and rough shipping date would be the big two!

Thanks for any/all info.

Cheers from Japan,

Paul :)
 
I've no official information, but lithium cells typically maintain over 80% of rated capacity after 500 cycles. This can very greatly depending on the specification - some of the hardcore cells I use for my giant scale RC planes do well to last 100 cycles, but they're discharging at up to 40C, and get charged at 5C. The redvolts are working hard in the context of powering electronics, but compared to providing motive power for brushless motors etc. they are in a relatively benign application and hence will likely have a very good life span.
 
Thanks, Brent. 90 days.
Are they lasting as long as Red Bricks? They've been tested for a long time now, so it would be nice to know how long the batteries lasted.
I ask because a Red brick might only go through two charge/ discharge cycles in a shooting day.
Revolts could easily do more, unless there's about 20 of them on hand.
 
I recently shot a Music video in Barbados and found that the REDvolt charger couldn't keep up with the battery consumption. I calculated a battery to be useful for 20 to 30 mins until I had to charge it. I wasn't pushing any accessories or Bomb EVF. I also found that it takes 2 hours for the charger to completely recoup the battery to it's full state. I do believe that the chargers should be rapid chargers. FYI..buy more chargers so you can cycle the batteries in order to stay ahead of the game.
 
Mark Andersen said:
I ordered Redvolts even though I haven't received my charger yet. I knew I wanted more so why not get them while they're in stock.

It sounds like chargers are only a couple of weeks away.
Click to expand...

I did the same.
 
Lithium technology batteries...

Depending on the particular Lithium technology used, use, cycles, charge rate, weight, etc., will vary widely.

Original lithium ion technology was dangerous. If one discharged or charged a battery too fast, it became a hand grenade.

Now you have a technology such as A123, which is a lithium-nanophosphate, which can withstand extremely high C rates for both discharge and charging.
One can also get better power density into the same size package with less weight. Sounds like win-win.
Guess which technology Tesla, Volt, DeWalt power tools, and a few others are using.
There is a video on A123's website showing a nail pressed through one of their cells. The result is a small puff of smoke.
No more hand grenades.
Reference: http://www.a123systems.com/

If Red isn't already incorporating this technology, they might want to take a look at it.
 
Randall, I think you're a bit mistaken about ideal batteries for Red. A123 cells are safer but they're optimized for long cycle life and have a lower capacity than other rechargeable lithiums. In other words, this would mean a heavier camera. I don't think anyone will be worrying about batteries in a few months once production is at full swing anyway.
 
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