Cobra #3850 owners manual .

Depending on the price point, it may be more cost effective to replace the units. Otherwise contact Cobra directly here: Support Cobra Electronics Corporation

Did you buy it from a dealer or a friend? From the dealer it should have been in the box and from a friend you outta luck.Do a google search for one ,you should find it that way.

Time for a new radio set.
Contact support here: Support Cobra Electronics Corporation

Try Cobra directly here Support Cobra Electronics Corporation

Try Cobra technical support here; Support Cobra Electronics Corporation

just have to wrap a bit of tin foil over the bottom of one battery and use normal nimh rechargeables. The Cobra's have a seperate circuit that must be made to differentiate between normal AA and rechargeables. The OEM battery has an exposed metal ring on the bottom of the battery. If a normal AA is put it and allowed to attempt to charge, it will start a fire. If you look, there is one contact at the negative end of one battyery that must be made for it to allow to charge in the base. You could scrape away the plastic, but a wrap of tin foil did the trick for me.

Here is the link for the manual for the Cobra radios: http://www.retrevo.com/support/Cobra-PR-3850WX-2-way-Radios-manual/id/23311dj078/t/2/

Right click here,
and click on "save link as" to download the manual

Your manual can be found here:

https://www.cobra.com/downloads/manuals/PR3850WX_MANL.pdf

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Yes, Cobra has the user manual for the PR3850WX available for download HERE