Internal battery for K3/ QRP

[Johnny Siu]

Hello Group,

In the case of K2 QRP version, there is an internal 12v lead acid battery.  Is
there any possibility that the K3/10 has the same arrangement?  In other words,
can the space occupied by the PA module be replaced with battery pack (say Li-Po
battery pack) so that the K3 can then be turned into a portable field day radio?

This idea may not be welcome by Elecraft (sorry, only my wild guess) because it
will kill the sales of K2?

Any views?

73

Johnny VR2XMC


     

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[pd0psb]

Or because the K3 current drain is 800mA minimum, while the K2 ranges from just 150-200mA?

73'
Paul
PD0PSB

>This idea may not be welcome by Elecraft (sorry, only my wild guess) because it
>will kill the sales of K2?

[Ignacy]

I think that SLA is too heavy LiFePO4 battery packs are much more efficient yet have a max voltage around 14.5, within the K3 specs. A 6A pack, e.g, as in

http://www.batteryspace.com/12-8v-lifepo4-battery-packs-from-6-6ah-to-9-9ah.aspx

may fit inside the KPA3 space and may be good for a few hrs of operation. These batteries need a charger with a limit on max voltage and max current, but a simple voltage regulator + a wart or a laptop PS will do.
Ignacy

[Johnny Siu]

Hello Ignacy,

Yes, correct, I am thinking of using Li-Po pack which is cheaply available in
Hong Kong.  BTW, are there any ways to keep the standy current of K3 down to
minimium?  Perhaps, some of the experienced K3 users may have a cue.

Li-Po batteries can be charged by multifunction intelligent charger which is
also cheaply available as well.

cheers,

Johnny VR2XMC



----- 郵件原件 ----
寄件人﹕ Ignacy <[hidden email]>
收件人﹕ [hidden email]
傳送日期﹕ 2010/7/8 (四) 10:05:29 PM
主題： Re: [Elecraft] Internal battery for K3/ QRP


I think that SLA is too heavy LiFePO4 battery packs are much more efficient
yet have a max voltage around 14.5, within the K3 specs. A 6A pack, e.g, as
in

http://www.batteryspace.com/12-8v-lifepo4-battery-packs-from-6-6ah-to-9-9ah.aspx

may fit inside the KPA3 space and may be good for a few hrs of operation.
These batteries need a charger with a limit on max voltage and max current,
but a simple voltage regulator + a wart or a laptop PS will do.
Ignacy
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