There are a number of posts suggesting problems with voltage drop in flight - all very difficult to confirm unless you have a logger etc. I believe both the spade contacts and the monitoring contacts in this battery are gold-plated - and so presumably are their opposite mates on the Quad. Would it be good practice to clean these occasionally - they shouldn't tarnish, but they may get dirty. My inclination is to wipe them with a cotton-wool-bud soaked in proprietary "contact cleaner" which may contain both a lubricant and perhaps alcohol and/or propane (as propellant). Any advice against this would be welcome.