Sorry for the delay guys, had some nasty weather on the 70-mile drive home...
Anyways, here is the picture:
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And here is the eerily similar Li-On unprotected battery previously posted in this thread:
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This is why I am scared, shocked, and mad...
That's not a protected battery. And while you cannot say for sure that it's not an IMR battery, it's close enough to make me nervous.
Once I have an example of these batteries in my hands, I'll track down what cells and chemistry they are for certain. Will be a couple of days before I have them. If someone else can confirm those facts before I do- more power to you and go for it.
At face value, the same top caps could be used on both IMR and unprotected LiON.
But in a cursory search I cannot confirm a Sanyo IMR 1600mah battery in 18650 form factor.