Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: I have a HP Pavilion model DV7-1270us with an 8 cell battery. Will a 12 cell battery fit and work in my laptop and will I need a different charger?
Document: perfect battery replacement for my HP Pavilion DV7-1245DX, works fine, fits perfect, better than the OEM. highly recommend this one.
I'm using this on a HP DV7-1245dx model. I've had it for a few months and so far it's working great. Battery life is around 4 hours for normal use, a bit less if I'm doing something like streaming a lot of full screen video. This is a secondary computer for me, so and I haven't paid attention to what the recharge time is like.
This is actually my 2nd laptop battery--first one from another amazon.com partner that was useless and would not work. That company did reimburse me at least.This battery fit right in, laptop kept running, it immediately began charging...very pleased. I also like the &#34;bar&#34; that is built into the battery that raises the laptop from being flat. Really good design and much better than original.
I bought this for a three-year-old HP Pavilion dv7-1000 series (I think dv7-1245x, but I don't have it handy to check); the original battery was completely dead. So far it works great. The battery fits well in the computer. As a high-capacity battery, it bulges out at the bottom, tilting the laptop up, which I actually prefer, so that's nice too.
My HP Laptop is about 3-4 years old and the battery was not holding a charge, so I started looking around for a replacement. I quickly decided that local options (Batteries Plus, etc.) were WAY too expensive, I found this one on Amazon that was actually more cells and power than the OER battery. It fit perfectly, just extended out a little from the original &#34;profile&#34;, and works great!
It said it was brand new and yet it only last one to two hours without the charger. I have a different laptop that could last at least four or five. Ive had it less than a month and it wont even charge fully.
The laptop is a better tool with this new battery. It runs cooler and longer. Angle is better for desk work too. HP should have shipped them with a power plant like this from the get-go. Good price and fast shipping btw. Thanks for that.
The battery I bought was over two years old and though unused and stored, made no difference as its performance was compromised. Capacity was less than 100% even after following the procedure to calibrate the battery. Battery now stands at 682 days old by HP battery check program, so this battery was about ~650 days old when I purchased Dec 14th.Lithium ion batteries by the nature of the technology even if they are not used are susceptible to the internal cell oxidation building up on the plates inside.
I read where some folks said that this did not work. It works very well as far as taking a charge and holding it. I am fixing a laptop up for a friend who is clueless. Now I am going to look bad because the lock tabs on the battery do not line up with the lock on the notebook. After having it fall out when lifting it for the first time, I thought that maybe the locking latch wasn't in the right position.
This product has held up very well for its cost. I dont remember how long my original battery for the hp pavilion dv7 lasted but i feel like this one is far superior.
Answer: Yes, the 12 cell battery will work as long as it is the correct model for the HP you have and no you will not need a new or different charger. I have done the same, upgraded my system battery from an 8 cell to a 12 and it works fine with the same charger.