Is there (in addition to the AA batteries) another circular style battery and if so - where would it be? Temporarily away from home - where the manual is....Thank you..

Depending on this style, there may be a cap on the end that you can remove and slide out the old batteries and slide in the new batteries. Be sure that they are facing the correct direction. Another style will have a bottom piece that turns a little bit and then comes right off exposing the three AA batteries.

AA batteries are used to keep the clock and memory presets saved in addition to the main battery that powers the AM/FM radio itself.

In my experience you'd better choose high capacity Li-ion AA batteries, and high capacity rechargeable batteries will be much better.

the subwoofer burns up. i had one actually start smoking and thank god we were not away from home as IMO a fire would have started....

Yes, 2 AA batteries. Just insert them correctly.
They don't last as long as the CRV3 lithium battery pack though
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Bought it 3 years ago, still using the same battery after taking 1,000's of pics. I also keep a pair of regular AA's as a back up when I'm away from home

The camera uses very common "AA" batteries, but infortunately AA batteries come in various "stengths", and the FE130 requires a very high strength AA battery- you may have a battery, that will fit in the camera, but just doesn't have the power for your camera, Also, the batteries may be "new" to you (you bought them recently), but they may have been on the store shelf too long (most "throw away batteries have Expiration dates on the package and sometimes on the bateries themselves- if they are still "in date"- have someone check them with a battery tester or voltmeter- if you don't have either of those- see if you have some other device ( a small flashlight) they might fit in to check- occassionally batteries go bad. There is also the possibility is that you purchased AA batteries that are rechargable, like NiCad, that don't have to be thrown away), but they need charging before they can be used, and regularly to keep their charge. If you tell us what the battery label says and any date info it might have we can probably know more.

Yes you can, as long as the batteries are the same style and fit the older Ryobi tools. The Ah rating is a capacity rating. The higher the Ah, the longer the battery will last so the 1.7Ah will just last a bit longer than the 1.5Ah batteries, but yes you can use them on older 18v Ryobi tools. I do it all the time.

In addition to AA size batteries (alkaline batteries, Ni-MH batteries), a dedicated AC adapter (sold separately) can be used. The other AA size batteries cannot be used.