Batboard

I've recentky bought some Ni-Mh batteries. Is it ok to charge them in this (brick of a charger) or is it only made for Ni Cad? The bottom of the charger seems to get very warm when charging..Thanks, Kevin

If your "brick of a charger" is the original NTN4635A (standard charge) or NTN4633A (rapid charge), then the answer is no. These were originally designed for nicads only.

I have used NTN4633C and NTN4633B chargers upgraded with the "C" modification successfully for about 5 years with various aftermarket NIMH batteries with no problems.

Yes i have the original charger. I'm charging one non ni cd in it. hopefully it won't blow up. So what type of charger should i get for it if i keep the radio?

I've been off the board for a few years and just getting back up and running. and also would and impress charger i think the name is be something i would need. I'm not too familliar with them

Thanks for the help

No IMPRES for that old beast... earliest you'll find them for is the Jedi series...

Yea I figured that. What is the c modification or what type of charger should i get for these new batteries?

Here is a link to how to upgrade a "B' to a "C". It is intended to prevent overheating of NiCads but I have had good results with NIMH:

http://www.repeater-builder.com/motorol ... r-mod.html

There is a more elaborate modification specifically for NIMH that I have not tried:

http://www.repeater-builder.com/motorol ... r-mod.html

Both mods work, I helped write them and April found the mod to prevent the charger from going back on RAPID charge due to power cycling (1993).


The only difference is the thermistor value(s) in aftermarket batteries.