The older NiCd battery chemistry can supply a higher current than typical NiMHs, so NiCds are commonly used to power model cars or other relatively high-current-draw devices. New NiMH AAs have lower capacity (typically 1400–1600 mAh) than the highest capacity NiMH batteries (above 2000 mAh).
AA lithiums have a relatively low internal resistance that effectively provides unlimited maximum current that will flow when they encounter a low or zero resistance load. The simple AA lithium batteries will allow very high current flow and such equipment will not tolerate the higher current. This incompatibility with AA lithiums is somewhat common in less expensive equipment with either motors or electronic flashes. If the circuitry is designed to run at its maximum current load with AA alkaline batteries and does not provide adequate current limiting circuits of its own, it will draw too much current from rechargeable AA lithiums, recycling very quickly once, if that much, before burning out a circuit component.
Rechargeable AA-sized batteries based on Li-ion chemistry have also been introduced. Unfortunately, these batteries are rated at a higher 3.6 volts and are incompatible with most AA-based devices. However, voltage and mAh are not the only issues with these batteries.
Rechargeable AA batteries suffer from self-discharge, whereby a full battery loses its charge when stored for a significant period of time. The low self-discharge NiMH battery, is distinguished by a much lower rate of discharge, claimed to be around 8% after 60 days. These rechargeable AA batteries can be sold pre-charged and ready for use.
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Source: http://www.articlealley.com/article_1071165_10.html