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Author Topic: Internal DIY battery for KX2 ideas  (Read 3861 times)
AE5X
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Posts: 1029




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« on: December 04, 2016, 10:22:52 AM »

Been tinkering with different internal batteries for my KX2, then came across this which gave me the idea of upgrading the normal capacity (or cell brand) to something "more better":

http://ae5x.blogspot.com/2016/12/advantages-of-diy-battery-for-your-kx2.html

John AE5X
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K7DXT
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Posts: 37




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« Reply #1 on: December 04, 2016, 01:33:21 PM »

Interesting…will be interested to hear of the outcome.  In the meantime, is there something available that is closer to an equivalent but lower cost alternative to the factory battery pack?
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AE5X
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« Reply #2 on: December 04, 2016, 01:50:59 PM »

http://www.ebay.com/itm/391394113340?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

http://www.ebay.com/itm/221174761739?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

John AE5X
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KU3X
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Posts: 435




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« Reply #3 on: December 04, 2016, 04:20:09 PM »


Did you try either of the above to batteries in your KX2? Also, will the Elecraft charger safely charge battery number 2? That is, did you
try it?
Barry
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AE5X
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« Reply #4 on: December 04, 2016, 05:08:42 PM »


I am using them both and prefer the Bionet (cheaper) battery. It has a better discharge curve due (I believe) to the difference in the circuitry protection they each use. I'll post those curves to my website in a few days. For $15, the Bionet battery is a real champ and I believe would at least equal the performance of the Elecraft battery and at 1/4 the price.

Long story short, I am getting 2400 mah of real capacity from it when discharged at a 100mA rate. Also, each of three discharge curves, made over the course of 2 months and numerous charge/discharge cycles, lie perfectly on top of each other. That's a good sign indicative of a long useful life.

John AE5X
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AE5X
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« Reply #5 on: December 04, 2016, 06:29:25 PM »

PS
I don't use an Elecraft charger.
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K7DXT
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Posts: 37




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« Reply #6 on: December 04, 2016, 07:37:49 PM »

Thanks for the advice…I did buy the less expensive one.  What do you use for a charger?

Thanks again for the input.

Scott  K7DXT
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AE5X
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« Reply #7 on: December 05, 2016, 06:02:07 AM »

Hi Scott,

I use a Hi-Tech X1 Touch which is probably overkill for just charging Li-Ion KX2 batteries. There are a number of $25 options for Li-based batteries on RC hobby or Amazon. Something like this ought to work, though you'll need to put your own connector on it:
https://www.amazon.com/TLP-2000-Tenergy-Universal-Charger-3-7V-14-8V/dp/B001BEXDRQ/ref=sr_1_9?s=electronics&ie=UTF8&qid=1480946250&sr=1-9&keywords=li-ion+battery+charger

At this charger's .5A charge rate, it will take 5 hrs to charge a KX2 battery. Other chargers are available that will charge at a faster rate if that's important to you.

John AE5X
« Last Edit: December 05, 2016, 06:04:27 AM by AE5X » Logged

KB4MNG
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Posts: 274




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« Reply #8 on: December 10, 2016, 01:14:25 PM »

The battery in the kx2 is the reason I do not have one. They really should have designed an on board charging system. All modern electronic has a battery that can be charged without removing.
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KU3X
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Posts: 435




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« Reply #9 on: December 12, 2016, 12:52:04 PM »

The battery in the kx2 is the reason I do not have one. They really should have designed an on board charging system. All modern electronic has a battery that can be charged without removing.

 I have to agree that I'd rather have the charger onboard. But it's not a big deal. Besides, the KX3's batteries can be charged while in
the radio (I also have a KX3) and I think all those batteries are good for is to keep the internal clock going. The voltage of the batteries
is too low and they don't last. The batteries in the KX2 are great. I can have an afternoon of fun on one charge. I take an extra pack
along with me. If the internal batteries start to go low, I don't remove them on site, I just plug in the second set and recharge both when
I get home. They are super easy to swap out.

Barry, KU3X
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AE5X
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Posts: 1029




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« Reply #10 on: December 12, 2016, 03:32:57 PM »

I just got back last night from activating a NPOTA with my KX2/batteries:
http://ae5x.blogspot.com/2016/12/down-on-rio-grande-at-npota-rc01.html

I always bring along a 5000mAH LiPo but never seem to get to the point of needing it. My normal routine for these 6 to 7 hour activations is to have an internal battery inside the KX2 and another plugged in externally. I don't mind that I have to remove the battery to charge it since I use the opportunity to test the battery anyway with a battery analyzer.

John AE5X
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AK4YH
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Posts: 32


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« Reply #11 on: December 14, 2016, 01:34:42 AM »

The KX2 battery pack is three protected 18650 cells. You can easily make one for $25. I would add a balanced lead for charging. The reason the pack is not charged inside the radio is probably because of the risk of fire if something goes wrong.

Gil.
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AE5X
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Posts: 1029




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« Reply #12 on: December 23, 2016, 05:54:14 AM »

I've recently tested and graphed 5 options for an internal battery for the KX2:
http://ae5x.blogspot.com/p/kx2-batteries.html

John AE5X
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K7DXT
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Posts: 37




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« Reply #13 on: December 23, 2016, 09:44:51 AM »

Ah…my favorite subject for the KX2 so far.  Great report…thanks for doing the tests.  I've got the $15 option, and so far, so good.  Plan to get the top one on your list as well.

I've ordered a number of the 5.5 x 2.1 connectors via ebay:  http://www.ebay.com/itm/272180991208

I just can't bring myself to spend the kind of coin that Elecraft is asking for their batteries and charger.  These are good options…thanks again.
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N0SA
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Posts: 56




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« Reply #14 on: December 24, 2016, 05:28:21 AM »

John
 You say that you do not use the Elecraft charger but I already have their charger.
Would it work with these other batteries?
Thus saving the cost of another charger,
Larry
n0sa
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