With all of the models out there it could be a bit difficult to get a laptop battery. If you want to buy laptop battery yourself, try to go for a brand that's got a lasting reputation to support its quality. It isn't always correct that if you purchase a Compaq laptop battery that Compaq made it from nothing. In this time of specialization, almost all of the organization has their parts produced by 3rd party manufacturers who've got the abilities, experience and can guarantee quality.
If you take Sony laptop battery into bits, you'll see that each part isn't made by Sony them. Rather while the surrounding can have an obvious imprint of Sony, parts inside it might have different makers with their individual brand names labeled. This under no circumstances means the battery is in any fashion of a lower quality than it might be if Sony made it. To the reverse almost all of the parts of computers, laptops and accessories are made by individual affiliations which concentrate on manufacture of those products. A straightforward example would be your laptop with Intel Pentium processor. While your laptop may very well be of Compaq or Acer or Dell the processor is made by Intel who concentrate on producing of processors.
That having been said it may be reasonable to purchase a common laptop battery. By universal I mean those brands that aren't as popular. Fairly often they have parts from the same source as more reputed brands and may offer the same quality. The benefit in purchasing a common laptop battery is they offer a more acceptable price than their branded counter parts. Never the less, always go for a trusty manufacturer if it is branded or non-branded. Your store keeper might be able to give you additional info on the feedback of laptop batteries for common ones.
Now the brand is out of the way, I would recommend purchasing a laptop battery that offers at least one year guarantee. Inexpensive or costly I suspect this is the way to go. This option provides you a stress free period of a year in which if your battery fail to perform you can get a replacement or as noted in your guaranty statement. Though renovated or used laptops batteries may appear captivating, since they don't offer any guaranty it could be a bit dodgy investment since you can't envision their performance or longevity.
Another crucial issue to look into is the kind of battery to purchase. Laptop batteries are often of 4 types: the Ni-Cad, Ni-MH, Li-Ion, and Li-Poly. The Ni-Cad is more of a primitive sort of laptop batteries and isn't made by any big manufacturers. Though Ni-MH is a more recent and advanced battery type it ranks lower than Li-Ion and Li-Poly when talking of current produced. These 2 sorts of laptop batteries, Li-Ion and Li-Poly, are most complicated type and you must try and get them if feasible.
Keep under consideration to go looking for power rating of the laptop batteries too the volts and amperes. If not compatible to your laptop you shouldn't use them under any circumstances. Remember at all points you can ask the store keeper for clarification about the product you are purchasing and whether they're compatible to your system. Do not buy if you're not satisfied with what you hear.