Can using higher rated battery damage device?

Alright. So, I knew what I knew, but after reading and responding in here I wanted to break out the volt meter and test a few things. Just to be sure. But I'll get to that.

I've got a 2004 Toshiba Satellite A75 sitting up in the kitchen as the general purpose computer for me and the wife. I've got three batteries for it. Why? Well, I've got the original (still holds a charge) and two replacements for those times when I might be away from a power outlet but still might want to use it.

The Original Toshiba battery is 14.8v/6450mAh. The first replacement (I didn't purchase it) is a generic 14.8v/4400mAh. The replacement I did purchase is a RayOVac made 14.4v/6600mAh battery. It is sitting in the laptop at this moment, and is the battery I've used for more than a year now.

So, from personal experience I can say that using a battery with a slightly different voltage rating will NOT HARM YOUR LAPTOP. Heck, we are talking about running a laptop on a battery that puts out 14+ volts, that NORMALLY runs on 19 volts DC from the power adapter.

Oh, and all three batteries are designated as Li-ion

Now, as to the testing. I took a Li-ion battery from an LG phone... and the battery is designated as an LG battery (not a third party replacement) that is Li-ion and rated at 3.7v. It tested at 3.71v. So, I took a Li-ion battery from a Motorola phone. It was rated at 3.6v. It tested at 3.75v. Interesting. So, I took my stack of Li-ion batteries that I have for my Panasonic digital video camera. The one that came with it (printed as a Panasonic battery) is rated 3.6v, and tests as 4.09v. One of the replacements that is designated 3.7v tests at 4.11v. Another replacement designated at 3.7v tests at 4.03v

So, I checked the battery in the tester to make sure it was still good. Then I re-calibrated it. Then I tested a couple of DC power adapters just to be sure, and then rested all those same batteries. (Edit I also tested a mess of Alkaline AA batteries. We keep a stockpile of new ones for cameras, Xbox360 controllers, etc. All tested between 1.4 and 1.6 volts.)

So, again. What am I saying? I am saying there is NO problem with getting that battery. Provided that the battery casing was made for your laptop... meaning it will actually fit properly in your laptop. It is not going to hurt your laptop to use the 11.1v battery. I repeat. It is not going to hurt your laptop to use the 11.1v battery.

If you search Google you will get different answers, but I can tell you from experience, that if you get a battery with a higher voltage rating it will not work correctly in the laptop, and it may harm your laptop, and the battery. You need the correct voltage for your laptop. Now if Lenovo has an option to a different battery, I would ask them. The battery that you have is a 6 cell, check to see if they have an 8 cell.

Yes it can damage your laptop. But considering it's only 0.3V difference and assuming your laptop would actually turn on with the new battery, you might just experience extra heating in your laptop.

Anyway I wouldn't recommend buying a battery with higher voltage, look for another shop or just buy it online.

Refer to this question for more information Using a 20V power block on a 19V notebook

I wouldn't buy a battery from a vendor who offered you another voltage for the same model. Laptop batteries are by total capacity NOT by voltage, and there's a good chance something is off if its a battery of different voltage.

The battery connectors for a laptop are specific to both the laptop brand and often the model as well. Your vendor seems fishy - a quick check shows the standard battery for the model - the 43R1955 - see the post by Mark Lenovo - is 10.8V. DO NOT BUY A BATTERY OF ANY OTHER VOLTAGE.