Before purchasing batteries and chargers, make a list of all your needs and requirements. Some electronic devices require a special charger which is usually provided by the manufacturer.
Make sure the charger is compatible with your battery and you buy from original equipment manufacturers. If your electronic device uses only alkaline batteries, look for a battery that lasts longer. Oxygen alkaline batteries typically last up to 20% longer than traditional batteries.
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If you travel abroad a lot, you need to make sure that your charger has a universal voltage (both docking and dock chargers have this feature). The one with an international plug would be better.
For cell phones, it is advisable to buy a car charger in addition to your traditional charger, especially if you are always on the go. It is also important to consider how long it will take to charge the charger. Inexpensive, time-consuming chargers may not be worth the money.
Before you buy a charger, you should also check if the charger can tell when the battery is fully charged so that it turns off by itself. Battery chargers that are not equipped with this feature can shorten the battery life.
Of course you need to compare prices, but your decision is not based solely on price. You need to make sure that the charger has all the necessary features before buying it.