Someone help me understand all the fuss about battery life. I understand that this radio is a "hand-held" unit and designed to clip on your belt and stay with you all day, but what are you guys doing that it cannot be placed on electrical (115V using tranformer or 12VDC using a car power plug? I rarely ever need mine on battery only. If I'm home or in my shop it's on an AC transformer, if it's in the car it's plugged into the 12VDC power connection in the car. I guess if you're about in the yard and do not have access to your home or car I can see the need for batteries that last a period of time but it seems that some of you run it only on battery power no matter if you're home, in your car or anywhere. Just trying to understand.
People want their scanners to work as they are designed; the 668 is a portable, hand-held scanner, i.e. it should work on batteries for an extended period. I understand that, even though mine, and my other hand-helds, are usually running on external power. But I occasionally take one of them with me on batteries. With the updated settings developed by PSR-800 owners over the years, mine will run 10+ hours on 2500 mAh batteries...but if it only ran for 5 or so, I'd just take an extra set of batteries along with me. The fact that any scanner you can hold in your hand and put in your pocket will do the things that modern digital trunking scanners do kind of offsets any angst I might have over battery life. And yes, I know a 396 will last longer on 3/4 of the cells, and that a 106/651 will last longer on the same number as the 668. Everything is different.
I guess working with commercial gear over the years has made me kind of jaded when it comes to battery life. I've carried H-T's that would last literally a couple of days on a charge (given little or no TX time) and others that would barely get through 8 hours before they conked out. And even worse; I'm currently the custodian of an EFJ H-T that has never lasted more than 6 hours on a charge since it was brand-new. And it's battery pack weighs as much or more and is about as big as the whole package with some of those other radios. But it's a digital trunking radio so it consumes more power, I suppose, just to function. Yes, the battery's been replaced, the new one was no better than the two that came with it. So I have 2 spares to pack along when I get a run, which ought to last me...
My 668 is s/n 38XX and came with v.2.2, upgraded to 2.3 the day I got it, if that helps any. I run the volume pretty high all the time (yeah, I'm kinda deaf) but no backlight if I'm on batteries. Tried that once on medium level and got about 7 hours, IIRC...