is there any warning before the internal RAM BATTERY goes out?

[Timo]

Back on topic, regards the Virus battery, you should of course back up all your patches and multis using SoundDiver (for Virus C and below) or Virus Control (for Virus TI) before ever taking out the battery.

Thinking about it, I guess it makes sense to switch the batteries out after a few good years. Gonna grab a couple next time I'm out. I'd hate them to leak and damage circuitry. Apparently cheaper CR2032 batteries may be of a lesser quality and have a higher probability of leakage. Given the present Panasonic CR2032 ones have done really well for this length of time in mine, I'll be grabbing those.

Panasonic CR2032 3Volt Lithium battery.

[namnibor]

Originally Posted by plaid_emu

Don't be too paranoid about your battery, that said... stay vigilant in checking it.

Things can go badly real quick. My old KORG POLY-61 went from being a nice functional poly synth, to a retarded turd with corrosion on the main PCB in a matter of a few years.

The Korg Poly 61 is and has been NOTORIOUS for that happening and that is *not* a typical result of a battery simply needing changed in any synth. With a fully functional synth O.S., you will typically get a warning on screen upon power-up of "low battery warning", giving one time to sort it in a reasonable amount of time.
Just as it is pragmatic to back-up your computer DAW projects/files onto an external HD, it's good practice to save your precious patch and multi-set-ups with well-labled seperate folders containing sysex dumps in say the rare event your studio cat whilst on a catnip buzz runs through your cabling, causing unexpected power disconnect! Trying to say good practice to not wait until a battery change to do back-ups.
Both warranty sticker seals are still intact on my Virii KB and KC and know they have never been changed and still doing fine.
It would actually be fitting for a future Virus Synth to be fitted with plutonium battery, reflecting their namesake and call it Virus Half-Life, with optional lead shield and lead-waterfall action weighted keys!!!