Car battery usage

General CB Radio Advice and Troubleshooting

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Sun Mar 19, 2017 11:42 am

Hi just about to purchase a cb radio mainly for taking up on dales for the day. Question is how long will my car battery last? Should I be thinking of also purchasing a second battery/power source?
Thanks in advance
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Mon Mar 20, 2017 1:32 pm

Hi Dave,

It depends how big the battery is.

If it was 40AH (amp hours) for instance, this means you should be able to theoretically draw 1 amp for 40 hours.

As most 4 watt CB's draw around 1 amp on transmit then you could use it for 40 hours on constant transmit. However as CB's draw a lot less on receive, then it depends on how often you are transmitting.

On normal use I would imagine a car battery would last a few days before needing a recharge.

Andy :wink:
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