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        Q: Is a 3.6v AA rechargeable battery good, decent, or really good?
A: It has to do with the chemical response that produce the electricity . NiMH battery has a nominal charging of 1.2 volts and Li-ion battery has a nominal charging of approximately 3.6 volt   Nickel-cadmium ( NiCd )  The nickel-cadmium battery ( NiCd ) 's the firstly commonly used rechargeable battery on the market in order to contest the disposable battery . When completely charged , a NiCd battery will have a nominal charging of 1.2 volts . This was less than the 1.5 volts found with conventional zinc-carbon or alkaline batteries , but the majority electronic devices is operational full well with the reduce voltage . As a NiCd battery discharged , it retains a near continuous voltage making them magnificent choose for extremely high-drain electronics such as wireless power instrument and remote-controlhas contributed toys .   The advantages of a NiCd battery include their capabilities to be recharged several hundred times , and their resistance to high loads or increased . Disadvantages include a “ memory effect ” of charging tiers that are able dramatically reducing the servicing living of the battery if it 's not charged appropriately . The NiCd battery also contains cadmium , a heavy metal that is poisonous to the environment . All NiCd batteries ought to be recycled through various municipal and trade programs and not disposed with household rubbish .   Nickel metal hydride ( NiMH )  A nickel metal hydride ( NiMH ) battery is similar to a NiCd rechargeable battery , but with improved performance . Like the NiCd , the NiMH battery has a nominal charging of 1.2 volts that it retains for the majority of its servicing life with a very consistent discharge . The NiMH battery is considerably most potent than the NiCd as it has the capacity to hold about three times the energy . The ability to hold extra energy and their capacity to be recharged at any time without suffered from any “ memory effect ” makes the NiMH battery very popular for moderated draining devices such as flashlights , digital cameras , and hybrid vehicles .   The advantages of the NiMH include their cadmium-free ecologically friendly designing , their high-power capacity , and their speedily dipping retail pricing . The hugest disadvantaged to NiMH battery technology is the inability to hold a charging for an extended period of time . While an alkaline or NiCd battery is feasible to left in storage for months without energy losses , the NiMH battery will approximately totally discharge if left unattended for various months ' time .   Lithium-ion ( Li-ion )  Rechargeable lithium batteries ( Li-ion ) offer astonishing performance for their sized and weighting . A characteristic Li-ion battery has a nominal charging of approximately 3.6 volts—more than doubles that of a feature Alkaline , NiCd , or NiMH . They also weigh still less than the other kind of batteries . A Li-ion battery also has a very sluggish discharge rates and no evident “ memory effect ” from recharging . This makes them optimal for utilized in specialised electronics such as portable computers .   On the downside , Li-ion batteries is extremely sensitive to temperature and the way these people are recharged . High temperatures can result in the batteries is unsuccessful much sooner than their destined servicing living , and batteries that 're not charged appropriately with their manufacturer-provided chargers is feasible to hazardous ( most rechargeable battery recalling 're for Li-ion batteries ) . For this reason , and of avoiding their inadvertent utilized in NiCd or NiMH battery chargers , Li-ion batteries 're not sold in consumer-friendly sized ( AAA , AA , C , and D ) .  Sources following website/www.jdpower.com/articles/article ... .