Main Question or Discussion Point
What are the best and most cost effective rechargeable 'AA' and 'D' batteries on the internet in the United States?
ok, which rechargeable battery class is the least likely to 'explode' during recharging? :uhh:NiCad, NiMH, LiIon, lead acid, alkaline
'battery explosion':Attempting to recharge non-rechargeable batteries may lead to a battery explosion. Additionally, one must be careful to recharge a rechargeable battery before it is completely discharged, or reverse charging may occur.
'reverse charging':Under extreme conditions, certain types of batteries can explode violently.
With car batteries, explosions are most likely to occur when a short circuit generates currents of very high magnitude. A short circuit malfunction in a battery placed in parallel with other batteries ("jumped") can cause its neighbour to discharge its maximum current into the faulty cell, leading to overheating and possible explosion.
When a non-rechargeable battery is recharged at a high rate, an explosive gas mixture of hydrogen and oxygen may be produced faster than it can escape from within the walls of the battery, leading to pressure build-up and a possible explosion. In extreme cases, the battery acid may spray violently from the casing of the battery and cause injury.
Overcharging, which is charging a battery beyond its electrical capacity, can also lead to a battery explosion, leakage, or irreversible damage to the battery. It may also cause damage to the charger or device in which the overcharged battery is later used.
according to Wikipedia, order of improving energy per weight ratios :Reverse charging is when a rechargeable battery is recharged with its polarity (plus/minus) reversed. While reverse charging can occur when a user mistakenly inserts the battery incorrectly into a charger, it is most commonly caused when multiple batteries are used in series in a device. When one battery completely discharges ahead of the other, the other batteries in series may force the battery to discharge to below zero. Reverse charging may lead to explosion, leakage, or at best damage the battery and/or the device or charger.
Because of the denser packaging without the holes between cylindrical cells and the lack of metal casing, the energy density of Li-Poly batteries is over 20% higher than that of a classical Li-Ion battery and approximately three times better than NiCd and NiMH batteries.
A Nickel metal hydride (or NiMH); battery is a type of rechargeable battery similar to a (NiCad) battery but without the expensive and environmentally unfriendly metal cadmium. This is why they are sometimes called the most environmentally friendly battery type. NiMH batteries tend to have a higher capacity than NiCads and suffer far less from the memory effect. However, when compared with lithium ion batteries they have a lower energy density and a higher self-discharge rate.