charging batteries via USB power banks


boudou701

Link Posted 11/11/2015 - 13:38
hello,
I've done some research online and can't find any answers.
I would like to know if it's possible to use the USB power charger to charge the batteries of my KS2. I'm not sure about voltage compatibility etc - but also can't find any adapter type.
I'm planning on buying a solar charger, but it would be better if i can also use it to charge the camera batteries!
thx
KX film, ME Super, K-S2
Pentax 10-17mm, Sigma 10-20mm, Tamron 17-50mm, Pentax 55-300mm
Sigma 20mm f1.8, Sigma 24mm f2.8, Sigma 30mm f1.4, Pentax A 50mm f1.7, Pentax K 55mm f1.8
Metz 36 AF-4
--> borrow or rent Photography equipment from people around you on Needy Monkey - link

Jonathan-Mac

Link Posted 11/11/2015 - 15:11
I doubt this can be done without having a transformer of some sort between the two.
Pentax hybrid user - Digital K3 & K200D, film 645 and 35mm SLR and Pentax (&other) lenses adapted to Fuji X digital
Fan of DA limited and old manual lenses

richandfleur

Link Posted 11/11/2015 - 18:04
Some new cameras from other brands actually charge off USB which makes them ideal for travelling and for the likes of solar power banks etc. I'm surprised Pentax aren't offering this, as it fits with the concept of weather sealing and being rugged etc. As above though, probably not a lot of options given the current Pentax technology unfortunately.

Algernon

Link Posted 11/11/2015 - 18:44
Sebastião Salgado has solar chargers for his 645D gear.

A DSTE Battery I linked to on ebay in another post has a car charger included.

I've used the DSTE charger off the mains and it's excellent. RED LED for charging and GREEN LED when done. Doesn't wait around either when you put a battery on that's already charged it goes straight to GREEN.


--
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
Last Edited by Algernon on 11/11/2015 - 18:56

Tyr

Link Posted 11/11/2015 - 19:03
USB provides 0.5A @ 5V maximum (2.5W). Pentax (K-5/3) battery needs 0.4A @ 8.4V to charge (3.36W).

So technically it is not possible to do it with these cells. With power from two USB ports it could be possible, but that somewhat defeats the object.
Regards,
Dan

https://www.flickr.com/photos/honourabletyr/
Last Edited by Tyr on 11/11/2015 - 19:04

garnetgarnet

Link Posted 11/11/2015 - 19:38
There are a couple of usb battery chargers out there for pentax batteries. I settled on some power banks and a camcaddy2 for an upcoming adventure and the charger looks quite versatile, with the charger being adaptable for many camera battery types.

The charger is made by a portable solar company, so can work in conjunction with portable solar.

Ive charged a few from about 50% to full. Unfortunately I haven't had a fully flat battery to charge yet, but it seems to work!. The readout suggests it steps the usb 5v up to 8.4v to charge the li150 and li109 pentax batteries.

http://www.poweryouradventures.com/Camcaddy2

There's a really helpful person on the other forum, kadajawi, that uses usb chargers and power banks who is very knowledgeable on this technology.
Last Edited by garnetgarnet on 11/11/2015 - 19:40

JAK

Link Posted 11/11/2015 - 19:39
The Freeloader Pro Professional Solar Charger link comes with a 7.9v CamCaddy.
John K

mera

Link Posted 11/11/2015 - 23:02
I have charged my battery from a solar power bank using a Ex-Pro EZi-Power USB Charger. Seemed to work ok. When travelling I normally pack this charger as it is half the size of the Pentax one. It does state it needs a 5V 800mA input so may only work correctly on higher-powered USB power supplies.

johnriley

Link Posted 11/11/2015 - 23:15
The Pentax batteries last so long that I've never felt the need for portable recharging. I usually carry three batteries for each K-5 body and over a week away never get to using the third battery.
Best regards, John

boudou701

Link Posted 12/11/2015 - 12:28
thanks guys this is great - looks like the camcaddy thing is what i am after.

John - i have two batteries, the original and an inov8, the second being not very good in my experience.

I'm planning a potentially up to 10 day trip without power, somewhere cold (so batteries might not last) and i dont want to feel limited, especially if i start filming, which drags the battery crazy - nothing worse than having the red low battery showing up..!
KX film, ME Super, K-S2
Pentax 10-17mm, Sigma 10-20mm, Tamron 17-50mm, Pentax 55-300mm
Sigma 20mm f1.8, Sigma 24mm f2.8, Sigma 30mm f1.4, Pentax A 50mm f1.7, Pentax K 55mm f1.8
Metz 36 AF-4
--> borrow or rent Photography equipment from people around you on Needy Monkey - link

Gwyn

Link Posted 12/11/2015 - 12:52
If you are going somewhere cold then you need to keep the power bank warm. Don't rely on solar power to charge it either - there almost certainly won't be enough sun to charge it enough. It will flatten just as fast as camera batteries if it is cold.

I would buy another battery too, just to be on the safe side. Keep the batteries warm on your person and only insert in the camera when you are ready to shoot to maintain them as long as possible. When one starts getting low swap it out for a fresh one and warm the used one up again - you can squeeze more out of it that way.

boudou701

Link Posted 12/11/2015 - 13:47
thanks for the all the tips - that makes sense to keep the batteries on myself - i dont expect it to get too cold either - just under 0 at night.

I am going to Iceland end of May, because of its geographical position I would assume the UV are very strong at that time of year - so i would think the solar power to charge, although you are right it might uncharge at night!
KX film, ME Super, K-S2
Pentax 10-17mm, Sigma 10-20mm, Tamron 17-50mm, Pentax 55-300mm
Sigma 20mm f1.8, Sigma 24mm f2.8, Sigma 30mm f1.4, Pentax A 50mm f1.7, Pentax K 55mm f1.8
Metz 36 AF-4
--> borrow or rent Photography equipment from people around you on Needy Monkey - link

Gwyn

Link Posted 12/11/2015 - 13:52
End of May there will be plenty of daylight in Iceland. It is just south of the Arctic circle so doesn't get the midnight sun, but very nearly does. It may not even be as cold as freezing point then, even at night.

boudou701

Link Posted 12/11/2015 - 13:54
that's what i think too.

i also found this charger, with no reviews: http://www.amazon.co.uk/Lemix-DLi109-Charger-D-Li109-Battery/dp/B014L5W6NS/ref=s...

but seems to be the right one, charging on USB... worth the risk?
KX film, ME Super, K-S2
Pentax 10-17mm, Sigma 10-20mm, Tamron 17-50mm, Pentax 55-300mm
Sigma 20mm f1.8, Sigma 24mm f2.8, Sigma 30mm f1.4, Pentax A 50mm f1.7, Pentax K 55mm f1.8
Metz 36 AF-4
--> borrow or rent Photography equipment from people around you on Needy Monkey - link

JAK

Link Posted 12/11/2015 - 16:15
As it's designed for the K-S2 it might well be a good option. They say it can be used with USB Powerbanks, My cameras use the D-Li90 which only has 3 contacts. That Freeloader one may struggle with four (but maybe not!)
What Freeloader do sell that may prove useful is their Supercharger solar panel which is quite a bit larger than most that come with powerbanks.

There are reviews of other variants of the Lemix on Amazon, some give it five stars. If you get one, let us know how you find it.
John K
Last Edited by JAK on 12/11/2015 - 16:21
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