Solar lights are powered by rechargeable batteries. They are attached charged during the day by solar panels on the device. These batteries are resisting for a minimum of 1000 deep discharges which is at least 1000 nights of light. They are easily accessible and easy to replace. They only open the tray, pop it, and you are set.
The preferred batteries for solar lights are either nickel-cadmium (NiCad) or nickel-hydride Medal(NiMH). They are preferred because they complete draining of a host application, and easily modified without in a typical night. NiCd batteries are very durable and reliable. You can recover quickly loaded with a typical battery charger with power quickly. It can also be recharged slowly makes it an ideal candidate for the survey, with aa solar panel to sunlight. NiCd batteries should not be charged for a short time again. This result in a crystalline formation inthe battery which diminishes its performance. This is referred to as the "memory effect".
The niHM batteries are the next level up from NiCd batteries. They cost a little more but offer up to 40% run time. The biggest advantage of NiMH over NiCd is their ability to accept a charge at any time without suffering from the "memory effect". These also can be charged rapidly or slowly making them a good candidate to power your solar lights.
It has been said that when you First you should have your battery, you must have at least 3 full charge-discharge cycles before it run into the normal service. This will help to obtain maximum capacity of the battery. For solar lights, you can have them in a sunny location in the morning and evening they are ready.
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