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  Powering VHF Radio With Small Battery

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Author Topic:   Powering VHF Radio With Small Battery
andrey320 posted 04-10-2012 10:51 PM ET (US)   Profile for andrey320   Send Email to andrey320  
In thinking of the different things that may go wrong out there, a dual battery setup sounds like it may help in case of engine electrical failure and drainage of one battery. One may be able to use the second battery to use the VHF to summon help.
I have a single battery and don't really have space in the smaller Carolina Skiff console for a second battery.
What is the smallest 12v rechargeable battery I can keep on board to connect to the VHF in needed?
jimh posted 04-10-2012 11:37 PM ET (US)     Profile for jimh  Send Email to jimh     
A VHF Marine Band radio is a 25-watt transmitter. Most of them only draw about 7-amperes on transmit. You can run such a radio with almost any small lead-acid storage battery. A 12-Volt lead-acid motorcycle battery would have a suitable form factor. I don't know the designators of those small form factor batteries.
Jefecinco posted 04-11-2012 10:24 AM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
Perhaps a home alarm system fully sealed battery would serve. Radio Shack sells them for an outrageous price but mine seems to last at least five years. My gate opener uses the same battery and I seem to get about four years out the battery in that much greater load and outdoor environment.

Butch

andrey320 posted 04-11-2012 11:14 AM ET (US)     Profile for andrey320  Send Email to andrey320     
Thank you for the input Jim and Butch.

Butch, four years without any recharging?

Jefecinco posted 04-11-2012 07:56 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
The systems provide a constant trickle charge to the batteries.

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