Coil Master Tester Drained A Battery

This is the 521 mini V2 that will meter or fire a coil. There's a 3-way switch, with off in the middle.
I was sure that it was turned off, but in handling the kit bag, the switch must have been pushed and turned on. Even with no atty on the tester, it completely drained an 18650 battery.

This was confirmed on a multi-meter. 0 volts.
I know that this battery is done, but it's interesting that my charger completely ignored it.

Based on this, I'd recommend not storing the tester with a battery in it. It probably already says that in the instructions. Maybe there's one person out there that didn't know this already, so here it is.  


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