If you have ANY of the rapid chargers listed below DO NOT charge a Nickel Metal Hydride pack until you have read this article and modified your charger.
If you drop an NiMH battery into any unmodified charger for even just one charge cycle you can overheat it to the point of permanently ruining it.

In the table below, "Regular" in the "Charging Rate" column indicates a slow-rate-only 16-hour charger.

Part Number	Size	Charging Rate	AC Volts / Hz	Notes
NTN4633B/C [1]	Standard	Rapid	120/60	These two chargers are identical except for which power transformer, power cord and part number label are used during assembly.
NTN4634B/C [1]	Standard	Rapid	220/50
ELN1040B/C [1]	Standard	Rapid	240/50 Euro plug	These two chargers are identical except for which power cord and part number label are used during assembly.
ELN1041B/C [1]	Standard	Rapid	240/50 UK plug
NTN5538B [2]	Standard	Rapid	120/60	Black housing
NTN5539B [2]	Standard	Rapid	220/50 or 240/50	Black housing
NTN4635B	Standard	Regular	117/60	This is NOT a rapid charger
NTN4636A	Standard	Regular	220/50 or 240/50
NTN4666B	Compact	Regular	117/60	These two chargers are identical except for which wall transformer is shipped with the charger base.
NTN4667A	Compact	Regular	220/50 or 240/50
NTN5540A [3]	Compact	Regular	117/60	These two chargers are identical except for which wall transformer is shipped with the charger base.
NTN5541A [3]	Compact	Regular	220/50 or 240/50
NTN4668A/B	Gang [4]	Rapid	117/60
NTN4922A/B	Gang [4]	Rapid	220/50 or 240/50

1)There is an article on the Genesis index page on how to update any of the top four to the latest factory revision level. The only differences in the first four chargers above was the power transformer, the plug on the end of the power cord and the nameplate. The power transformers have a single primary winding and hence are not field convertible between mains voltages (i.e. 120v and 240v) without replacing the entire transformer.
2) These are, at the time of this writing, still in production. The only difference between the two part numbers is the primary winding of the internal transformer, the plug on the end of the power cord, and the label on the unit itself.
3) These are, at the time of this writing, still in production. See the article list below for PDFs on them.
4) The "gang", "6-pack" or "multiple" rapid chargers have six pockets and one IEC style (computer style) mains power cord. These were desktop units and most commonly seen in public safety (police/fire/ambulance) squad rooms or anywhere large numbers of batteries need to be charged at once. The NLN7967 kit mounts a gang charger onto a wall, the NLN7968 kit mounts it in a 19 inch equipment rack.

The RTL4226B is a "battery eliminator" that is nothing but an empty short battery case with a fuse and a pair of banana jacks. It is designed to allow operating a radio from an external 10vDC source in a test/repair bench environment. I have seen one that had an "edgewise" DC current meter cut into the case. You can make your own from a 15C80373B77 empty short-case battery housing, and a fuse holder. Adding a 10v regulator chip is a nice improvement and may save your radio if you slip up sometime and hook it up to a 13vDC bench supply.

The RLN4265A is a "battery eliminator" with a curly cord (like a microphone cord) that has a cigarette lighter plug at the end.

To be added: (contributions of information are welcome!)
Color information on the outer plastic cases and the escutcheons for the top six chargers above - i.e. part numbers for "shadow bronze" (Moto marketing's name for the stock HT600 color), grey, blue-grey, charcoal and black charger housings and replacement nameplates so that people that want to renew the appearances of their chargers know what parts to order...

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This page originally posted on 11-Apr-2007 by Mike Morris WA6ILQ.