In addition to the work that goes into advertising and getting an event going there's a fair amount of effort
involved in preparing for an event. For me, most of this is getting the batteries charged and testing out
the equipment.
I've had issues recently with my Tenergy chargers not wanting to fully charge the batteries in slots 3 and 4,
but when I went to test it later with a fresh set of equally discharged batteries, it didn't misbehave. Might
be something that doesn't act up until it's had some time to warm up, like when I'm charging over 100 AAs before
an event?