by RCModelReviews » Fri Feb 11, 2011 7:47 pm
The higher the capacity of an NiMH cell, the more fragile they become in respect to overcharging but I would think that 600mA was a "safe" charge rate for those cells.
What is the 12V setting though?
Was your charger set to the NIMH setting? On most 4-button chargers that simply means you can set the battery type (NiMH) and the charge-current (0.6A). Mine has no setting for voltage.
Are you saying that your transmitter module has died?
If so, which module are you using? Is it the standard Turnigy module(V1 or V2)?
Sometimes stuff just breaks but it's worth noting that these radios only use 5V internally so a fully charged 8-cell NiMH pack (which can be as much as 12V when hot off the charger) puts a strain on the voltage regulators that have to effectively get rid of more than 50% of that voltage -- often in the form of heat.
That's why I only use 2-cell lithium-Ion batteries in my TGY9X radios -- they run much cooler and longer.
However, lots of other folks are using the TGY9X with 8-cell NiMH packs and have no problems so you might have just been unluckly.
RCModelReviews.com, just the facts.