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Olympus OM-D E-M1 Mark II The second Micro Four Thirds camera that offers phase detect focusing so you can use Four Thirds DSLR lenses normally as well a Micro Four Thirds lenses.

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Old 28th June 2017
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Battery charging in the field

Hi all I have just come back from a trip to Scotland with my son in his motor home. I noticed that we could only charge my camera batteries when on a camp site hooked up to mains power. I noticed on my return that go outdoors has small inverters that charge from a cigarette lighter in the car -- 12vdc-240ac with a built in S/O. Has anyone tried this idea out? Or any other system?
Kind regards mike
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Old 28th June 2017
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Re: Battery charging in the field

Expro do a charger that runs of mains AND 12V (and their own batteries) although you may need to check comptability with Olympus chipped batteries.
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Re: Battery charging in the field

I just use a USB charger and a USB adapter for the car. It is not as fast as on the mains, but it works. Cost me $4 plus about $1.50 for a tiny digital DC voltmeter which I connected to the leads so I can keep an eye on the voltage. When it reads 8.4V unplugged, or about 9.3V charging, I know it is full.
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Re: Battery charging in the field

Thankyou both, I suppose it's horses for courses, I didn't think a USB would be powerful enough to charge the battery? How do you connect the em1mk2 battery? Can you post a link?
Kind regards Mike
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Old 28th June 2017
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Re: Battery charging in the field

Here's a link to the ExPro charger for the BLH-1.

I have the equivalent model for the BLN-1 for my E-M5, works fine.

http://www.exprodirect.com/product.p...&cat=8173&page

Regards.
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Re: Battery charging in the field

Thanks Peter for the link and info.
Kind regards Mike
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Old 29th June 2017
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Re: Battery charging in the field

Here is my home made jobbie...
IMG_0464.jpg

IMG_0466.jpg

IMG_0469.JPG

As these knock off chargers don't usually have any kind of automatic cut-off they only have two pins, + and -. The voltage readout tells me how far along it is. Note that it reads about 0.12V higher under load. I know that a fully charged battery reads 8.39V unplugged, so I just turn it off if it reads 8.5V while charging. I wired a USB charger into the car with a little switch on it so I don't have to have the ignition on to power it through the cigarette lighter socket. This charger's output is only 500mA, which is why it is slow, but it works and as yet I have not felt the need to shell out €80 on a second battery.
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Re: Battery charging in the field

Hi Dan, thanks for posting the images, it doesn't look as completed as I thought I will take a look in maplins too see what they have,once againt thanks
Kind regards Mike
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Re: Battery charging in the field

These are the parts:
http://www.ebay.co.uk/itm/DSTE-Camer...4AAOSw2gxYo~Fd
http://www.ebay.co.uk/itm/DC-3-0-30V...MAAOSw44BYa0c-

There is enough room inside the charger for the voltmeter. Just cut out a hole, glued it in and soldered the + to + and the - to -.

I also stuck a piece of dark foil over the voltmeter as it was quite bright and a distraction while driving.
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Re: Battery charging in the field

We gave up on inverters in the motor caravan many years ago. You can get a 12v supply for laptops, printers, dongles, phones and BLN1 batteries. We don't carry a mains cable although we used to when skiing and using a small generator. Newer 12v seems to be USB but you can get adapters to standard 12v.
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Re: Battery charging in the field

My USB charger died today, just quit charging after 10 minutes on a 40% full battery. Oh well... have to think of something else.
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Old 2nd July 2017
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Re: Battery charging in the field

I have used a simple 150w inverter plugged into 12v power supply socket in my car for several years now without any problems. I have charged laptop batteries, camera batteries and many other devices too. IMHO this is the best way if you have access to a 12v supply as you retain all the safeguards of your OEM charger. Good quality inverters can be had from between 20-30; some also include a separate USB socket. The majority of problems involving inverters occur when the load is too high. Charging camera batteries, iPads and laptops even at the same time should not be a problem.
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Old 3rd July 2017
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Re: Battery charging in the field

Sound sensible enough...
I have ordered one of these to replace the insides of my charger.
http://www.ebay.at/itm/LM2596S-DC-DC...UAAOSwgY9XegNr
It can be adjusted to just under the 8.4V/1100mA max charging power so it can't overcharge the battery. I will just connect it to 12V in the car and see what happens. If that fails, I will look into the inverter option.
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Old 3rd July 2017
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Re: Battery charging in the field

I have purchased a 300w 12dc-240ac inverter from Maplins. There is a normal 3 pin S/O and a USB port outlet. I can then attach the OLY battery charger to it. I have already charged the battery using this system and it still only takes two hrs to charge through the cigarette plug in my car. Not the cheapest way to go. Also if your considering going down this route ensure your car cigarette socket is live with out the ignition on. It also can be attached to the 12v supply directly with crocodile clips. Wth OLY batteries at circa 75 I considered this the safest way forward.
Kind regards Mike
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Old 4th July 2017
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Re: Battery charging in the field

One thing I read about inverters is about their own drain on the battery, even with nothing attached. They draw around 0.3 to 0.4A themselves, which is three times what the Olympus charger draws. So one should be very careful NOT it leave it connected when not in use. Any experience with that?
There are a number of small ones here used for around 15-20, but still I will try my dedicated charger first. Parts are on the way...
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