I too have used Jump Start batteries, but I have never used them to 
run my TMV71, or any other rig greater than 25 watts output.

What you have to watch out for is that you do not run the voltage of 
the battery down too low during use. Doing so will damage the battery.

You won't notice this lower voltage in receive mode until it is much 
too low.

There are numerous little circuits to monitor the voltage, but none of 
them unfortunately are accessible as far as I know. I have been 
intending to suggest to at least one garage manufacturer of such 
gadgets that they consider including a microwave type beeper that 
could be switched into the circuit to sound whenever the low voltage 
LED flashes. I just haven't gotten around to doing that yet.

I will make one more comment in a separate message in order to keep 
this one from being too long.

K5XU




----- Original Message ----- 
From: "KK4AHX Darren Duff" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, December 13, 2012 6:24 PM
Subject: Backup battery for fixed station.


Hi all.

Now that I have my fixed station set up like I want I need a battery 
backup
but I am not sure what to go with. I want something that could last me 
at
least all day..... What are others using and what do you recommend for 
use
with the TMV71a. I have a flow charger that I got from someone new 
still in
the box, but I do not know how it works, or how to hook it up once I 
get a
battery.



73.
Darren Duff.
amateur radio station KK4AHX.

Vice President,
Cherokee Amateur Radio Society.
http://www.cherokeehams.com

Cherokee County ARES.
http://www.cherokee-ares.org