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Illegitimi non carborundum
I went for the Lola system with heated gloves, think it costs about £800 nowadays. It's marvellous and you get to pull a smug face while your toasty warm and watching your buddies freeze. On serious note I think they make deco diving much safer especially when you get to big numbers. Plus it gives you another tool to use if shit hits the fan and you need to get out quicker.
My wife and I both have Thermolution heated vests - they are great and not just for big deco dives, I mostly use mine so I can do a nice hour dive at the colder times of year and not come out gibbering. The alternative for me is using a monster thick undersuit and an extra 5kg of lead which my back does not forgive me for. it Needs a bit of care, know other people who have broken the flexible wires and had to send it for repair, so be careful taking it on/off - batteries seem bulky on your side when you 1st put it on but honestly you don't notice them after 2minutes..
A larger battery (20ah or more) will deliver a weekend of heat and light and avoid taking dive kit off the boat (apart from crack bottle).
I use the Light Monkey 20ah dual output for just this and my 35W HID cuts through the plankton the whole time whilst my heated vest keep me toasty.
I've the 'standard' Santi heated vest, Santi "Thrmovalve" and a Light-for-Me 18AH heating battery
The hassle is additional kit, making sure it's connected, loosing the blind connection plug, jumping in once without connecting the E/O cable and flooding the battery and killing the circuit board...
However, I wouldn't be without it for UK diving except for summer.
The big battery lasts for a 2 hour dive and a second shorter dive. Haven't flattened it, but have seen the charger say it's empty.
As far as I'm aware, the small Santi 5Ah battery would last less than an hour, so far too short for me.
(Maffs... 5Ah x 12v = 60Wh. Vest is rated at 50W, therefore an hourish and seriously flattening the battery which is generally considered poor form)
Do like the Santi 24Ah battery. Seriously considering that as a replacement for the LfM battery if I can't get it fixed.
Last edited by Wibs; 17-05-2019 at 10:29 PM.