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Techmoan Merchandise at TeeSpring


Pick of the Camera Reviews

(Click the pictures for reviews & links) 


Yi 2 - Best Budget 4K 

Gitup Git2 (My Pick)

Xiaomi Yi

Dazzne P2

DR02 D - Best Budget Dual Cam

Yi Ultra 2.7K
Mobius (also works as a Dashcam)
Polaroid Cube+
Sena Prism Tube

My favourite USB battery power Pack

This is the excellent USB power pack I use when I travel.

2 x 2.1amp outputs. 8400mAh capacity.

Two digit Led display shows battery level


What SD CARD should I buy?

If you want an SD Card for your camera - these are the ones I use and recommend. 

I'd strongly recommend not to buy any SD cards off ebay - I've heard about too many issues with counterfeit cards - often sold on by unwitting resellers. My inbox regularly gets messages from people who bought a £150 camera then cheaped out and bought a £3 memory card on ebay - Then when it doesn't worth they blame the camera! It doesn't make any sense. Good memory is cheaper than it's ever been - see the links above.

A lot of HD cameras will not work properly with cards larger than 32GB (cards over 32GB are usually SDXC rather than the SDHC standard used by 32GB cards. SDXC cards use the ex-FAT system rather than FAT32 - in short they are a different standard). - so don't just buy the biggest card you can afford - read the specs in the manual to see what it accepts.


RECOMMENDED CARDS (for action cams - see dashcams below)

CLASS 10 UHS-1 CARDS (For HD Cameras)


U3 CARD (For 4K cameras)




The SD card in a dashcam is re-written over, more frequently than in other types of cameras. Some manufacturers void their guarantee if an SD card was used in a dashcam. So, no surprise, there are special High Endurance SD cards made just for's some.


VERY IMPORTANT. These links take you to the product, however Amazon have three different ways of selling. There's Amazon Direct - This means that you are only dealing with Amazon themselves, then there's other sellers that use Amazon's facilities - these show as Fulfilled By Amazon and finally there's Market Place sellers that advertise on Amazon, but operate independently.  I strongly recommend that you only use the first...the Amazon Direct - Sold By Amazon option. Even if it appears that you are paying a couple of £/$ more it is more than likely you are comparing the price of a real item against the price of a fake.

To give you an idea of the extent of the fake goods problem. In a 2016 survey by Apple - 90% of the 'Apple' chargers sold through Amazon - using the other the two methods..which includes the "Fulfilled by Amazon" option -  were found to be counterfeit....90%! 


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Batteries Cables and Confusion

Extending the power lead on a dashcam.

I’ve had a lot of questions recently about extending the power lead on the Mini 0803 dashcam - because the supplied 3.5m lead isn’t long enough for some vehicles. So to answer those questions here is the solution I use myself. (Links to all the products mentioned are at the bottom).

i) Buy a new USB A Male to Micro B Male lead of the right length (link to 5m cable below)

ii) Buy a vehicle accessory socket (lighter plug) to 5V adaptor. Most dashcams and phones need a 1 Amp supply, so I use an adaptor that outputs 2x1Amp. That way I can power my dashcam and my phone at the same time. I use a Griffin - beware there are lot of cheap fakes of this which are useless and probably dangerous too. For that reason I’d only buy from Amazon Direct themselves and not even any of the resellers on there. If you find a cheap one (below £5) then buy elsewhere.

If you drive a vehicle with a 24V power socket (HGVs etc) then you will need a 24V capable USB power adaptor, rather than the 12V adaptors commonly used in cars.

Don't be afraid of amps.

Whilst I’m on the subject of amps, the level of confusion about these is surprising, because when it is stripped down to the basics, there is very little to know. Below is my quick generalised guide.

(If you believe yourself to be an expert in this field and feel the urge to post a comment to educate everyone about electricity - Don’t. This really isn’t the time or place).

Most modern USB devices need 1 Amp to charge and often devices like phones and tablets will charge quicker when they can draw more amps. You really don’t need to research the specs of your devices though, because it’s foolproof.

USB chargers always supply 5V. Whether they plug in a wall, a car, a bike, use solar, a wind-up handle, a battery pack, and irrespective of what country you are in - you’ll always get 5V out of a USB socket.

Now as far as amps go, that’s easy too. A device will only draw as many amps as it can handle. So if you plug a phone that only needs 1 amp to charge into a 2 amp USB charger, it won’t damage it, because it only takes the level of amps it needs. If you plug it into a 500 millamp device (0.5 amps) it may not charge at all.

If you plug an iPhone into a 2.1 amp iPad charger, it will charge quicker than they it does on the iPhone 1 amp charger. The same goes for many other devices that come with a 1 amp charger in the box. Computer USB ports supply 500ma or less - hence the slow charging when you attach your phone to your computer.

Below are the links to all the items mentioned above.


Battery Packs

To all those people who ask me whether you can run a Mobius camera (or insert camera here) on a USB battery pack the answer is yes. If it can run off USB power from a car or a wall plug then it will also run off USB power from a battery pack. All USB power looks the same to the device - it’s just 5V. The only thing you need to check is whether the battery pack you choose outputs sufficient amps to power the device.

With battery packs the amount of power they store is shown as mAh (milliampere hours). The larger the number, the longer the battery can power your device. A bigger capacity battery will also be physically bigger/heavier and take longer to charge up itself - so it's up to you where you draw the line. Outputting 2 amps from a battery pack will drain it quicker than outputting 1amp. Below are a few battery pack examples that have 2.1amp output sockets on them.

Wall Plugs

To those people trying to charge an SJ4000 action camera on their PC USB ports and wondering why it never charges up - then you know what you are doing wrong. Buy a 1 amp (or better still a 2.1 amp) USB wall power adaptor and charge it on that. I'd recommend you try to replace your 1amp chargers with 2.1 amp models wherever possible as you might find that your existing electronic devices can charge in half the time.

Right, hopefully that’s that cleared up now.

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Reader Comments (40)

Oh we got wires crossed here.

The adaptor that I used is a dual port that is rated at 2.4 amp .

When used with a single cable to a single device they both will work ok. Its just when I connect both devices each with there own cable the sat nav charges but the camera does not. So I'm assuming the camera is not getting enough power as the sat nav is taking most of it.

I think Need a dual port Usb adaptor that will allow both ports to deliver up to 2.4amps each , that should solve the problem I think .?

October 21, 2015 | Unregistered CommenterRick

Yes you'll need a 2x 2.1 amp output USB adaptor (like the one I use linked to in the article above).

October 21, 2015 | Registered CommenterTechmoan

Wicked, Just the job.

Many Thanks for your help on this. I can now carry on with the power supply project .

October 21, 2015 | Unregistered CommenterRick

I am running my sj4000 as a dash cam I am using the usb cable in a lighter usb adapter but it seems to stop recording after about 45 mins with a battery warning , do I need to buy a proper car cable to use the camera in the car. many thanks martin

November 13, 2015 | Unregistered Commentermartin

URGENT: The extension cable that you need for the Transcend DrivePro 200 car camera is NOT the USB to Micro B that is mentioned in this article, with the link to Amazon. This cable does not fit because the socket on the camera is a MINI B, not a Micro B.

The correct item to buy from Amazon is as follows:
LINDY 5m USB to 2.0 Cable Type A to mini B

The current price is £5.95 + delivery. Sold by Amazon EU S.a.r.L.

Now I'm off to return the micro cable that didn't fit. p.s. I reckon Techmoan is a wonderful site and I'm grateful for all the useful articles and videos. Keep up the good work, please.

December 17, 2015 | Unregistered CommenterIan

I have two sj4000 cameras that I need to start at exactly the same time for 3D work. I have been told that I can
switch both cams to car mode and switch a usb power to each on and of simultaneously.I am
new to all this so could you please outline hardware needed to do this,,,,portable. I.E power supply,some way of distributing
this power to each camera via switched usb????
Thank you .

January 3, 2016 | Unregistered Commenterbrian

We always read reviews from Techmoan, as well as viewing his videos containing technical aspects for many items. Simply stated, he is one of the finest reviewers on the internet. I'd like to ask a question if I may. Plan on purchasing a wall charger to charge various das cameras, basically all 5V as stated above in previous posts. I would like to purchase the Anker Power Port 2 (IQ) 5V/ 4.8A, AC 100-240V~0.7A 50-60Hz @ 2.4 A per port. Would this suffice to charge dash camera’s?

Seeing that I’m inquiring, could any elaborate on the input ( AC 100-240V~0.7A 50-60Hz) as to how this is relevant to the device being charged? All replies are most welcome.

* Actually, there are two chargers, one consisting of 20W and the other at 24W. Would either be better or worse contingent upon the usage?

January 9, 2016 | Unregistered CommenterSynoptic 12

hi, after deciding to install a dash cam I watched Techmoan youtube info and chose the koonlung K1S suites my needs.
I need to extend the front camera cable lead but unsure of the class of cable etc.
Any help and where to buy very much appreciated.
Great informative shows.
Thank you.

January 25, 2016 | Unregistered Commenternigel

I found this article extremely helpful, and might move on to buy a nice power bank that has 4x 4.8Amp USB ports and is able to pass through charge (charge the battery as it also provides power to the USB ports). This would allow the cameras to work in parking mode when the car is off, and charge the battery+power the cameras when the car is on. I only have one camera now, but want to expand to a 4-way system in the future.

April 5, 2016 | Unregistered CommenterJJtoob

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