MAHA has told me it will never provide a C or D adapter for the C9000. Not
wanting to figure out how to reliably attach wires to the charger's terminals,
I charge my C NiMH cells * in an Eveready charger with a NiCd / NiMH switch on
it. I monitor the charge with my hand. When the cell gets a bit warm, I pull
it.

* I use C cells in a potato-masher flash and a classic Sony FM radio.


Also known as "negative pulse charging" or "reflex charging".
There are commercial chargers that do this.
Pulse-Power:
http://www.fm2way.com/batterycharger/technica.htm
"Negative Pulse Charging Myths and Facts"
http://www.powerdesigners.com/pdf/Tech%20Brief%20Negative%20Pulse%20Charging%20Techn iques%20Myths%20&%20Facts%20-%20Final.pdf
I'm not convinced, but then I haven't tried one of these chargers.

This principle isn't new. The basic system dates back to the late 60s.
Motorola made a "pulse-discharge" charger for Honeywell flashes. The claim was
not only that it could quickly recharge the power pack, but that it would
often "heal" a badly performing or even "dead" pack.

"Modern Photography" gave the system a rave review, confirming that it worked
as claimed. Several years later I asked Burt Keppler what happened to the
system. He said Honeywell pulled it because there were too many instances of
the packs exploding. When I asked him why he never reported this in "Modern",
he had no answer.