Can't speak to Cobra radios, but I have several Audiovox radios that work very well with their rechargeable packs. I will not get non-rechargeable radios again as they will eat up regular batteries too quickly if you have them on all day long.
Something you should consider is perhaps stepping up to GMRS radios instead of FRS radios. (I have both types.) I initially got the FRS, but with the terrain of my spread, the don't work that well (and cell phones only work on certain areas of the property as well).
Anywho, GMRS has a 5 mile range vs. the FRS 2 mile. I've been very happy with mine. Now the downside - /forums/images/graemlins/frown.gif
1) cost,
2) regulation.
The GMRS radios generally cost a bit more (although prices are coming down significantly). The real pain is staying legal with the FCC. No tests or anything like that - just filling out paperwork on their web site and sending in a payment of an extra $75 or so.
There are LOTS of people who just pick up GMRS radios at Best Buy and use them with out getting a license. I haven't heard of anyone getting arrested for this, but doing such
is illegal. Here are a couple of links for you to check out regarding this...
Illegal radios
Getting a license
Look to the attachment of this message to see a comparison in size between the two types. (again, these are just a couple of examples, you may find smaller ones in both flavors.)
Anyway, more info than you requested, but hopefully worth reading. /forums/images/graemlins/wink.gif