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Thermalution yellow grade plus owner. I did a bulk buy with a group of friends and to my knowledge we have all had issues with the cheap wires they use. Buzz buzz buzz oh great another $340 cad for batteries. The wires don’t last. I’ve also test dove the venture heat, the internal batteries are way too uncomfortable. While I appreciate the over engineered wires and connectors the bulky batteries are a no go.
I’m in the process of external batteries pack, bulkhead and vest. Everything else is a toy.
Interesting note about the issues.
To @wetb4igetinthewater's point, I'd wager that Warm 'n Safe heated motorcycle gear has vastly more hours of real world testing and use behind it than pretty much any underwater heated gear. I could be wrong. But, I would be willing to bet I have 10X as many hours in my Warm 'n Safe heated gear as anybody on this board has on a single set of underwater heated gear. So, is it REALLY that important to stick to scuba-specific heated undergarments? I'm gonna say that MY jury (in my head) is still out.
@wetb4igetinthewater my earlier comment was in regards to the OP's post and mine, neither of which has anything to do with using a battery pack inside the drysuit. Thus why your comments about the dangers of using non-scuba-specific don't seem relevant. At least, as I understand it, your point was about using a battery pack internal to the drysuit - which you could do with any heated gear, scuba-specific or not.
Now, if we were talking about battery packs, then yes, I would agree with you that you should stick to scuba-specific ones - whether it's internal or external to the drysuit. But that's not what was being discussed...
I dove this jacket today. I wore a Marino wool long sleeve underneath it and a 4th element expedition over top. As per manufacturers recommendation of base layer and something overtop.
I could not feel any heat from it, however the gloves worked. And yes it is wired correctly and working. Battery is fine as well. Just couldn’t feel the heat. I’ll try again tomorrow with a lighter base.
I think I may need something directly on the skin.
I dove a Warm & Safe heated shirt and SF glove liners today.
Men's 12V Heat Layer Shirt
Water temp was about 45.
The shirt is very comfortable to wear and with a Fourth Element Arctic Expedition overtop the performance is very good.
I did 2 - 25 minute dives to configure gear... and then a 45 minute dive.
Thank you @stuartv for the link to Warm & Safe.