A Laptop can not use a different battery from the one which it had been designed for. Therefore, even if the battery fits into your computer, it does not mean that it will work appropriately with your laptop. The most sought out feature of the laptop is its capacity to use a battery, so you have to use a good battery to be able to enjoy this feature at its best.
A better battery should be a rechargeable battery with internal cells. Remember that all shapes and terminal location differ according to the model. Extra care should be taken for the rechargeable batteries because they use electrochemical reaction, with the electrons sent from the negative and positive terminals.
An expert on batteries gives the following information, on how the laptop battery works. The electrochemical oxidation from the negative electrode makes the electrochemical to reduce on the positive electrode. The inverse reaction happens if the electricity passes in the opposite direction.
For the rechargeable batteries, the reactions above are reversible on both sides. But for the non-rechargeable battery, the reaction happens only in one direction. If you use incompatible batteries, they may cause a short circuit. So it is imperative that you buy the batteries according to the model of your computer. The manufacturers make it on purpose to make sure that you buy spare parts from them. Therefore you have to use Toshiba laptop with its battery, the same as the Compaq laptop or any other brand out there.
Certain companies had come up with stories about the benefits of a refurbished battery; the truth is that those batteries will not last as long as a new battery. Instead of buying the second hand battery, just buy a new one, the money you think that you are saving will still be used in buying a new battery within a short time. Just buy a new battery when there is an offer, you can keep it until you are in need of it. Or you can use it as a spare battery when you have to stay away from the power source for long.
Remember that the better way of looking out for your Laptop is to put the best battery into it. This will not merely give you peace of mind; it will make your laptop stay with you that much longer!