sd, replacing cells and battery packs isn't all that hard but you may have missed a few points and as a result may have issues.
Replacing 7 cells with 8 means the new pack will never be properly charged with the old charger. In addition the radio may be getting too high a voltage and be damaged. Generally, a bad idea to change the voltage of the assembled pack.
The two devices you found may not have been fuses
. Typically there is at least one fuse, yes, but also one or two diodes to prevent the battery pack and the charger from conflicting. If you omitted one or both of those, you may find problems charging as well.
Swapping NiCd and NiMh can also cause problems as the voltages and charge routines can be different, and if the new cells have 2x or 3x the capacity of the typical 600mA commercial
NiCds that were used (for a reason, they're cheap
AND rugged) it may need 24 hours now to get a full charge. That you can usually get away with, if you don't mind the longer charging times that will be required.
But there are more gotchas. The cells with solder tabs have the tabs welded onto them with explosive welding. When you solder to a "button top" conventional battery, at either end, there is a very good chance you have partly melted the rolled-up material inside with some damage and premature failure to come. It is not a good idea to cheap out this way, you really want to buy solder-tab batteries if you want them to work and last.
And there's all sorts of quality in batteries. Some will self-discharge within 30 days, others will hold power for most of a year. Rated capacity doesn't tell you how long it will hold on the shelf.
I rebuilt the pack in my SH VHF mainly because they had discontinued them and I had no time to wait for a commercial rebuild
. But The Nicad Lady and Bulldog Battery are two of the places that will do rebuilds for you. Properly, with solder tab premium batteries, and all fuses
and diodes kept in place. And very often they are about the same price
that new batteries alone would be.
Kudos on the DIY spirit, but if one of those soldered batteries now overheats due to the internal damage from soldering--you might not want to leave them charging while you are out or asleep. I've seen NiCd packs blow up, and it ain't pretty.