Most of the info here is generic in nature and can also be applied to any other cell phone. So for instance, if someone else in your home has an LG or Nokia or Motorola this would work for them as well. It's a brief history of the battery types used in modern-day cell phones.
Battery type: often misunderstood and misrepresented. There are four battery types used in cell phone batteries. The following list is from oldest to newest. Whenever possible, you DO want the newest type. Fairly obvious I know, but, most of us never consider asking about it.
lithium polymers – It is the latest and greatest battery used in cell phones. They have a higher power density than the other types. This allows manufacturers to provide either a thinner or lighter battery, or some combination of both. They can be hard to find. They are available for several Samsung phones. Lithium Polymer batteries do not suffer from the poor memory effect and can be recharged anytime.
Lithium-Ion (Li-Ion) – This was the latest battery technology before lithium polymer. They have a higher power density than NiMh and NiCd batteries. Li-Ion batteries generally come standard with most phones. For most people, this battery technology represents the best combination of size, capacity, and value. These types of batteries don't suffer from the poor memory effect and can be recharged anytime.
Nickel Cadmium (NiCd) – The oldest battery type used in cell phones. They are the heaviest and lowest capacity battery type. These can be somewhat hard to find.
Nickel Metal Hydride (NiMh) – They are lighter than Nickel-Cadmium batteries but heavier than Lithium batteries. These should be cycled once in a while for optimum performance.