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Thank you Mike

Regarding your question.
I live in Mexico City, in a Neighborhood called Colonia del Valle.

Regarding the electronics, I'm a Mechanical Engineer (just got my degree), not so good in electronics but with strong basis. I need to check 3A fuse, and with the multimiter all the conductivity on cables, and printed circuit, as well as in the condensers and resistances(No problem, I opened it yesterday and It's quite simple). And I'll try slow charging with the battery pack at 8 or 12 volts (Have to take a look at the battery pack when I arrive home), and 10 mA/h. Or try to balance it with an equivalent batery pack from another of my radios, I hope the Futaba and Hitec have the same voltage and current, and I'll check the polarity with the multimeter, before trying to balance.

Thanks again