Author Topic: HT Radio Powerbank Generation 2  (Read 3544 times)

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GreekMan

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HT Radio Powerbank Generation 2
« on: October 16, 2015, 01:59:58 PM »
this I got to brand, maybe as the "GR-P Powerbank"

so... this has been an evolvement of my former design.
This was a battery case with 4 18650 Lithium-Ion batteries wired 2s2p and feeding 7.2 (8.4)V to the radio through dummy batteries in a AA battery case.
This one goes one step further.



It uses 4 18650s of a working voltage of 16.8V and a step down DC-DC converter set to output 13.2V.
The converter is thermally on an aluminum heatsink with its fins outside the powerbank.
A LED indication light will be added as soon as I calculate the forward volatge of those I have and find the proper resistor.



My Kenwood TH-F6/7 radio (and the Wouxons too) can take car battery DC voltage AND operate with it.
Most significantly when the radio is operated by such voltage the medium power setting becomes 2watts from the original 0.5W!
Powerbank capacity depends on the batteries of course. the ones used are 3100mAh ones but you can get as high as 3500mAhs these days. Speaking in watts that is 44W exactly four times the radio's battery power.

A side benefit is that the radio is also charged when not in use, and fast charged too.
Working current is 2A according to the original Kenwood accesory specs, so we are good on various parameters.
Batteries are charged independently outside the case of course, and are matched cos 4 lithiums in series is not that good idea.



that is all, if you like it wait till I receive the parts for my next project.. ;)
« Last Edit: October 16, 2015, 02:22:21 PM by GreekMan »

spacecase0

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Re: HT Radio Powerbank Generation 2
« Reply #1 on: October 16, 2015, 03:32:26 PM »
nice setup,
I may copy that idea,
but doubt I could do it so neatly

AD

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Re: HT Radio Powerbank Generation 2
« Reply #2 on: October 16, 2015, 03:38:13 PM »
Very nice work GM. Do you have schematics for this that you would share?
 
The only dumb question is the one that did not get asked!!

GreekMan

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Re: HT Radio Powerbank Generation 2
« Reply #3 on: October 16, 2015, 04:33:53 PM »
Oh come on guys, you are far more experienced than me.

AD, there are no real schematics.
The controller has marks on it, the connectors take the - lead on the outside. If you know how to wire batteries in a series, you need nothing more.

want me to link the materials?

AD

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Re: HT Radio Powerbank Generation 2
« Reply #4 on: October 16, 2015, 06:17:20 PM »
Please do
The only dumb question is the one that did not get asked!!

Rockntoy

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Re: HT Radio Powerbank Generation 2
« Reply #5 on: October 16, 2015, 10:33:18 PM »
That would be a good project to do.
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GreekMan

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Re: HT Radio Powerbank Generation 2
« Reply #6 on: October 17, 2015, 03:13:43 AM »
I will start with bad news....
the bare box I used cannot be found anymore.
You can buy this and remove the circuitry.
https://www.fasttech.com/product/1280801
https://www.fasttech.com/product/1590400

http://www.ebay.com/itm/UP-to-10000mAh-Power-Bank-Case-USB-Charger-Box-4x-18650-Battery-w-LED-Light-DIY-/131550045221?var=&hash=item1ea0fe6425:m:me96Y3iy6RaLSsyzlq8Bwow
http://www.ebay.com/itm/Universal-10000mAh-Power-Bank-DUAL-2-USB-Charger-4x-18650-Battery-Mobile-DIY-Box-/311375824437?hash=item487f720635:m:m0r8F415W-CzkpXkmCmkO9Q

an alternate would be these, but you got to reconfigure it a bit.
http://www.ebay.com/itm/USB-Power-Bank-Case-Kit-4X-18650-Battery-Charger-DIY-Box-For-All-Cell-Phones-/381368089029?var=&hash=item58cb4f39c5:m:mBeWLi4QymFVBpY7UgtCikg
https://www.fasttech.com/product/1280901

converter
http://www.ebay.com/itm/High-Quality-LM2596-DC-DC-module-3-40V-Adjustable-output-step-down-power-Supply-/331141026126?hash=item4d198b114e:m:m-dKGTtrhmlm9UtQawUEZrA

connectors
http://www.ebay.com/itm/1-set-Lockable-5-5mm-x-2-1mm-DC-Power-Plug-Socket-Female-Panel-Mount-Connector-/270953874605?hash=item3f161c04ad:m:meEmWhAmAoSew2bXuSW6uow
http://www.ebay.com/itm/DC-Power-Male-Plug-Right-Angle-Connector-3-5mm-x-1-35mm-Adapter-Plastic-Handle-/300973699661?hash=item46136e324d:g:j3gAAMXQzr1R0ZAf

Heatsink
Buy the anodized kind, anodization is non-conducting.
Also cut to length and trim off the furthermosst fins to form a socket for the battery body.
I cannot find the original anymore (85mm x 25mm x 5mm), but you might do with 2pieces of this
http://www.ebay.com/itm/5pcs-25x25x5mm-High-Quality-Black-Aluminum-Heat-Sink-Router-Vedio-Card-H58-/181110877996?hash=item2a2b0caf2c

GreekMan

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Re: HT Radio Powerbank Generation 2
« Reply #7 on: October 17, 2015, 03:31:04 AM »
assembly pics





and wiring....notice the reverse spring for the + battery pole