K1 Battery Solution

[Brett Howard]

I'm looking for a good low weight small volume battery solution for using
with the K1.   I'd like to keep it outside the radio. I'll simply plug it
into the back of the radio to power it.  I'll probably put the same plug as
is in the radio onto a charger or just make some APP pigtails...

I'd like to be able to run the radio at full power so being able to get to
13+ volts would be great. I'd like charging to be fairly simple and safe.
I'd like the battery as well as the radio to fit into one of Rose's K2
cases... Another thing is that I would like a solution that will have decent
longevity if it's somewhat expensive. But if its a fairly inexpensive cell
then I'd put up with replacement every so often.   I'd like to be able to at
least get 4 hours at full power using "normal contest operating"
assumptions. I'll probably only use it casually so that should allow for
more like 7 to 8 total hours hopefully.

What solutions might you all recommend?  If you can provide links on where
the items might be purchased that would be greatly appreciated.

Thanks gentlemen

~Brett (N7MG)
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[Tony Estep]

Model helicopter pilots (among others) have created a consumer market for
just what you want. Lipo packs of all sizes, and chargers to match, at a
number of sources including

www.cheapbatterypacks.com

Tony KT0NY


On Sun, Jan 9, 2011 at 11:04 PM, Brett Howard <[hidden email]>wrote:

> I'm looking for a good low weight small volume battery solution....
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[ARDUJENSKI]

Take a look at this site for battery alternatives for the K1
 
_http://www.onlybatterypacks.com/main.asp_
(http://www.onlybatterypacks.com/main.asp)
 
Alan KB7MBI
 
 

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[k6dgw]

Mike, KD9KC, found some "9.8Ah" Li-Ion batteries on eBay, for Buy It Now
price of $38.  We both bought one.  It turns out you get about 7.5Ah
before the voltage hits the low cutoff on my K2 and his FT-817, but that
works out to about 10-14 hrs of "semi-contest" operating time.  They
came without instructions and all the printing on them is in Chinese
[tried for a translation at the local Sechuan restaurant ... not so
good], but they came with a wall-wart charger.  Rose built my case to
hold it in a side pocket, it weighs about 14oz.  I can send you a photo
if you would like.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2011 Cal QSO Party 1-2 Oct 2011
- www.cqp.org

On 1/9/2011 9:04 PM, Brett Howard wrote:

> I'm looking for a good low weight small volume battery solution for using
> with the K1.   I'd like to keep it outside the radio. I'll simply plug it
> into the back of the radio to power it.  I'll probably put the same plug as
> is in the radio onto a charger or just make some APP pigtails...
>
> I'd like to be able to run the radio at full power so being able to get to
> 13+ volts would be great. I'd like charging to be fairly simple and safe.
> I'd like the battery as well as the radio to fit into one of Rose's K2
> cases... Another thing is that I would like a solution that will have decent
> longevity if it's somewhat expensive. But if its a fairly inexpensive cell
> then I'd put up with replacement every so often.   I'd like to be able to at
> least get 4 hours at full power using "normal contest operating"
> assumptions. I'll probably only use it casually so that should allow for
> more like 7 to 8 total hours hopefully.

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[iw7dmh]

>I'd like to be able to run the radio at full power so being able to get to
>13+ volts would be great. I'd like charging to be fairly simple and safe.
>I'd like the battery as well as the radio to fit into one of Rose's K2
>cases... Another thing is that I would like a solution that will have decent
>longevity if it's somewhat expensive. But if its a fairly inexpensive cell
>then I'd put up with replacement every so often.   I'd like to be able to at
>least get 4 hours at full power using "normal contest operating"
>assumptions. I'll probably only use it casually so that should allow for
>more like 7 to 8 total hours hopefully.

Dear Brett,

I made a modification to KBT1 option just to have more power and better audio response.
I use 6 Lipo cells 2 x (3 x 3,7V/900mA). Voltage range is between 4,2V (fully charged) and 3,2V (discharged).
My inspiration was an interesting article of WA3WSJ (KX1 battery modification).
There are some notes on my qrz.com page but, however, it'll be difficult to have 4 hours at full power using normal contest operations. Instead you'll find it perfect for casual operations.

73', Enzo
IW7DMH