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NiMH Batteries

Discussion about Tx, Rx, Servo's, Batteries, Chargers, and all the other things we like to talk about..
Moderator: VinceC
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Peter Balcombe
Posts: 1399
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: NiMH Batteries

Post by Peter Balcombe »

I cannot recall seeing BWC in my NiMh setups, but it certainly was an issue with the NiCad setups.
As has been mentioned earlier, the problem only affects the Black (-ve) wire - hence the name.
The corrosion does seem to be a chemical process affected by the negative end of the battery and the corrosion slowly creeps along the black wire (starting with copper wire discolouration, progressing to the copper turning into black powdery residue) from the battery, through the switch harness to the receiver if left connected for long enough.
It may well be that this process is caused/accelerated by moisture or a damp environment.
The corrosion will cause gradually increasing resistance (hence voltage drops) in the affected parts of the wire, eventually causing receiver drop outs as the servos take more current as they move, or just plain failure to make any meaningful electrical connection.

Thus the best way to minimise its impact is to ALWAYS disconnect the battery from the rest of the wiring when not in use.
This will restrict the corrosion to the black wire (check battery end if possible as the corrosion will start at that end) and connector contact which all need periodic checks.
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