http://www.ebay.com/itm/like/261466818240?lpid=82&chn=ps&ul_noapp=true
These are 10 Gauge connectors. 12" long. Cut in 2, and use the other end, to solder on to the wire to the base radio, which has a fuse in it, and then solder these on them:
http://www.ebay.com/itm/10-12-GAUGE-VINYL-RING-5-16-YELLOW-25-PK-CRIMP-TERMINAL-CONNECTOR-AWG-GA-CAR-/271244497851?hash=item3f276e93bb%3Am%3AmDyn_AS9HPXkC6z2z7Qx0WQ
Then, get one of these Batteries:
http://www.ebay.com/itm/12V-50AH-Sealed-Lead-Acid-Multipurpose-Battery-/151247717180?hash=item233711033c:g:Y8UAAOxy0bRTF4LM
Be sure you have one of these in the system:
http://www.ebay.com/itm/Waterproof-Maxi-Fuse-Holder-with-Red-8-Gauge-Power-Cable-Wire-each-/161292410327?hash=item258dc6ddd7:g:wXgAAOxy9X5TYsXi
And, and a computerized charger:
http://www.ebay.com/itm/Schumacher-SSC-1000A-SpeedCharge-2-6-10-Amp-Battery-Charger-/272410673836?hash=item3f6cf102ac:g:A0AAAOSw4shX5B3Y
Back when I sort of threw this together, a 30 ah Sealed Lead Acid battery was often sold with a new GPS. I was powering the base, and a Electric fence around the base, so I simply wanted MORE POWER (grunt grunt)
This is my fence charger. It can be powered with internal batts, or external, 12 volt, or 6 volt.
https://www.farmandfleet.com/products/471272-zareba-low-impedance-electric-fencer-controller.html?feedsource=3&gclid=CLW_yLnK288CFUg6gQodiOACwA
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