High pitch battery noise?

I've got three batteries in total. One is dead as my car's cargo, one is half way to the hospital, and the other has a pretty good life to it. (It lasts 2 hours+)

I took the "good" battery with me to Los Angeles and I noticed when it's plugged into power, it has been making a high pitch noise. I never noticed it before, but this battery was always in my 600MHz book.

I got back last night, so today I swapped the half dead battery back in, and the high pitch noise is gone.

Did I mis-seat the battery, or does it sound like I should keep this away from gasoline?

 

Sounds to me like you need to feed your mice more than corpses! May I suggest some cheese with that whine!

 

Modly -

I'd suggest verifying that the noise is indeed coming from the battery itself; high-pitch noises like you describe are very hard to locate sometimes, but they are more often associated with switch-mode power supplies than DC power sources. It may be that the healthier battery is able to draw more current & load up the AC adaptor or the regulation circuitry inside the laptop; or it may be that you have some leaky capacitors in this laptop's power section that you don't have in the 600.

Another potential issue may be that the battery alters the voltage available to the LCD inverter, causing it to whine.

Try taking a reasonably long screwdriver & place the end of the handle at your ear so that it presses against the bone there; then use the other end to probe around the case of the battery, laptop, & AC adapter (Old mechanic trick good for lots of troubleshooting). If you have a dense wooden rod or a plastic rod you can actually probe live circuit areas the same way; otherwise (Obviously) AVOID SHORT-CIRCUITING ANYTHING THAT MAY BE LIVE WITH THE METAL TIP OF THE SCREWDRIVER.

mnem
Lookitchew! Talkin' likes ya acterally KNOW sumtin'!

 

Well, it'll do it with the book off too, and I've tried two AC adapters.

I do suppose it could be an issue with other parts though.

I'll try it out again in the 600. I just got it back before I left, so perhaps it's been whining too.

 

I have a cf-29 mk1 and when i unplug the power adapter i get a high pitched whistle noise i think its coming from the processor does any one know?

 

U should believe Mnementh. Switch-Mode circuits produce this highfrequent noise. U can here such noise on many electronic-parts in our daily life. Like mnementh said the capacitors could be leakage, i would add, that the coil(s) in the power-circuit are often glued to the board to prevent noisy-sound. If the glue became some heat and the coil a little to much shake, it looses the connection to the board and the whine will penetrate ur ear.
But it doesnt matter: some people buy such whiny stuff for money to banish insects - believe they ;-)

 

on the 29s ive had several units that have a whine as you call it and it usually ends up being the inverter. and it will do exactally what you are describing modly. only certain conditions will cause it to have the sound.