Rating: 
Summary: Great!
Review: As soon as I started using the vibrating battery, I was happy because you know how embarassing it is when your cell phone rings during a class... anyway, I saw nokia batteries like this selling for like 70 bucks on other websites, so i'm happy I found it cheaper. happy happy happy!
Rating:
Summary: A neccessary accessory for anyone
Review: I've been using nokia 5100/6100 series phones for years, and a vibrating battery is a neccessary accessory. No matter how loud you set the ringer, there will be times where you can't hear the phone ring over a lot of noise (football games, crowded restaurants). Other times you might want to keep the phone on silent, but still be able to tell if someone's calling without disturbing others. I do have to say that if you don't keep the phone in your pocket or on your hip, you won't be able to feel the vibration though. Also, the warning about letting the battery fully discharge before charging is very important. If you don't run down your battery fully by talking frequently, instead letting it discharge on standby, then you have to be extra careful. All of my first few batteries severly underperformed after a few months due to this.
Rating: 
Summary: Does the job, but not forever
Review: It adds a bit of weight and it could vibrate with a bit more "oomph", as mentioned by other reviewers. But it does get the job done. My one concern is that I've had this battery for about two years, and it no longer seems to hold a charge for very long. I drain it and discharge it frequently, but I still can't seem to get it to last more than a day or two, even with light usage.Am I asking too much of a NiMH battery to expect it to work like new for more than a couple of years? Well, I'll probably just buy another one. But consider yourself warned: it doesn't last forever.
Rating: 
Summary: Always low or dead
Review: The Nokia 900 mAh NiMN Extended Vibrating Battery is anything but extended unless you are counting the time you will have it in a charger trying to keep it charged. I have had mine 41 days and am already having trouble keeping it charged. My phone is on about 10 hours per day with minimal talk time, Usually less than 30 mins. per day.
Rating: 
Summary: Be quiet!!!
Review: The vibrating battery is a great idea for people, like me, who do not like to see everybody staring at you when your cell phone rings. I also am very annoyed by other people's cell phone ringing louder than the person next to them. A vibrating battery is a great solution to that. This particular battery could, however, be a little stronger. When I take the bus or on the subway, I can sometimes not feel it vibrate, and therefore miss a call (which is not the end of the world, by the way!!)
Rating:
Summary: Be quiet!!!
Review: The vibrating battery is a great idea for people, like me, who do not like to see everybody staring at you when your cell phone rings. I also am very annoyed by other people's cell phone ringing louder than the person next to them. A vibrating battery is a great solution to that. This particular battery could, however, be a little stronger. When I take the bus or on the subway, I can sometimes not feel it vibrate, and therefore miss a call (which is not the end of the world, by the way!!)
Rating:
Summary: is that a phone in your pocket . . .
Review: the vibrating feature on this battery is great, but not as strong as i had expected it to be. i cannot feel it ringing if i have it in a bag or purse, only if it is in my pocket or on my belt. do not put the phone down on a table or a conference desk if you do not want other people to hear it because it can be load. otherwise it is great, and it is neat how it vibrates in time with the tune of your ring. i have not let the battery run down before charging since the first few times i used it and i have had it for 6 months with no troubles.
Rating:
Summary: Good but be careful when you charge
Review: These extended vibrating batteries are great! They will easily last 3-4 days on one charge. Also the vibrating feature is fun. The only bad thing about the extended battery is it really adds weight and mass to you phone. Another thing i should say is that since this is a Nickel Metal Hydride (NiMH) battery you have to be careful when you charge your phone particularly for the first few times. It is recommended that you should only charge this phone when it is completely discharged. DO NOT charge if it is only have way discharged. Otherwise you mess up your battery and battery performance will significantly drop.
Rating:
Summary: Nokia Battery
Review: This battery is pretty cool the only thing is that my nokia 5165 Cell phone does not fit into my other holder. That is a small price to pay for a vibrating battery. The battery holds an excellant charge. Try out this battery.
Rating:
Summary: Vibrating Battery
Review: This Battery that is a vibrating battery is an excellent choice, before when I heard a cell phone go off with the same ringtone I would always look down to see if it was mine, But with the vibrating feature I now now it's for me.
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