Seems I am corrupting the eeprom on my APM 2.6 almost every time I connect my batteries. I am using 6S 10Ah packs with XT60 connectors. Every time I connect them, I get a large spark. I am guessing this is what is corrupting the eeprom. Should I change to a protected connector? Use a power switch? Anyone else had this problem?
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Ian, it turned out to be the optical sensor. I eliminated that and the problem stopped. With two 6s 10,000 batteries, I'm still getting a spark, but it's much smaller than before. Haven't erased the EEPROM since. I figured it out by process of elimination. Unplug one sensor, GPS, etc. at a time, reflash and see if it still happens.
No, I use this module https://www.sparkfun.com/products/10644
That's what I mean by "sensor". Anything that plugs into your APM may be the culprit. Make sure your jumper position is correct for your setup as discussed here http://copter.ardupilot.com/wiki/common-apm-2-board/. Double check the wiring on the power module.
Also, try only connecting one BEC from the ESCs. I have read that connecting too many can cause some weird behavior.
Somethings not right in your electrical setup you should not be getting big sparks with XT60s that was a reason people started moving to them. They take more current and are put together easier.