I am talking about the Spektrum DX7 standard transmitter and receiver batteries that come as a package. The transmitter batter is a 1500mAh NiMH, but I am not sure what the mAh on the receiver battery is. I also have a spare 1500mAh battery which I will be charging on the way to the field in case the standard one runs down. I had a situation the other day where I wanted to fly more, but after checking the power of the receiver battery I found that it was too flow to continue to fly.

Will I do any harm to top off the transmitter and receiver packs after being dormant for 8 hours after a 12 hour charge?