EliteLED.com - About NiMH Battery

About NiMH Battery

Nickel Metal Hydride (NiMH) is the next generation of rechargeable batteries that emerged
after NiCd. It uses hydrogen absorbing alloys in its negative electrode (anode) and nickel
oxide in its positive electrode (cathode). Sanyo first released its version of NiMH, Twicell, in
1990.

NiMH batteries are more environmentally friendly than NiCd, and offer much greater battery
capacity per volume than NiCd. Another major advantage of NiMH over NiCd is their ability to
accept a charge at any time without suffering from the "memory effect" (described under our
section on NiCd). The memory effect does exist in NiMH, but the extent is a fraction of that in
NiCd. A good way to charge NiMH batteries is either with the "burp" charging described in
our NiCd section, or with a negative Delta V terminating charger. Before charging your NiMH
battery, check with the charger manufacturer to make sure their charger can handle NiMH.
NiMH batteries should not be left in a charger for more than 30 hours.

Features:

more than 500 charge/discharge cycles
1.2 volts is the nominal voltage of one cell
high volumetric energy density, generally lasting twice as long as NiCd
quick charge rates possible with controlled charging
temperature range of -20°C to 60°C
sealed configuration with gas release vent
more environmentally friendly than NiCd
less memory effect than NiCd
many size configurations availabe including AA, AAA, C, D, 9v, and many sizes in between

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