What's the best battery for mobile phones?
What’s the best battery for mobile phones?
When buying a replacement battery, the buyer often has
the choice of different battery chemistries. Li-ion and Li-ion polymer batteries are used on newer phones, whereas the NiMH and NiCd are found in older models. If the buyer has a choice, the sales person may advise a customer to go for the highest capacity rating and to stay away from the NiCd because of the memory effect. The customer may settle for the slim-line NiMH because it offers relatively high capacity in a small package and is reasonably priced.
Seemingly a wise choice, an analysis in this chapter reveals that other chemistries may have served better. The NiMH offers good value for the price but falls short in expected cycle life. Although excellent when new, the performance trails off quickly after about 300 cycles due to decreased capacity and rising internal resistance. In comparison, the Li-ion can be used for about 500 cycles. The best cycle count is achieved with NiCd. Properly maintained, the NiCd delivers over 1000 cycles and the internal resistance remains low. However, the NiCd offers about 30 percent less capacity compared to the NiMH. In
addition, the NiCd is being removed from the mobile phone market because of environmental concerns.
Switching to environmentally friendlier batteries is fitting,
especially in the mobile phone market where the NiMH performs reasonably well and can be economical. The battery disposal issue is
difficult to control, particularly in the hands of a diverse user group.
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