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Shearwater Teric or Perdix?

Discussion in 'Shearwater Research' started by Coconut Monkey, Mar 30, 2019.

Shearwater Teric vs Shearwater Perdix

  1. Shearwater Teric

    37 vote(s)
  2. Shearwater Perdix

    94 vote(s)
  3. Both of these do not suit you well

    8 vote(s)
  1. Marie13

    Marie13 Great Lakes Mermaid ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Great Lakes
    I wear my Perdix about halfway up my forearm. I found that when it was closer to my rings, the button on the left would sometimes get activated by the cuff and turn on the compass. I solved that problem for good by wearing my backup Geo 2.0 closest to the ring and then Perdix next to it.
    JBFG likes this.
  2. stuartv

    stuartv Seeking the Light ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Lexington, SC
    I'm not sure what issues y'all are having. This is me with a Teric (and Kubi dry glove rings) last weekend. After a dive. Teric is still right where it was when I put it on. Admittedly, when I ordered this drysuit, I did get it with the little tabs (as you can see on my left wrist) that watch straps go through, to keep them from being able to slide around.

    I don't have a picture, but my neoprene drysuit has no dry glove rings and the Teric works just the same on it.

    Also, when I wear 2 computers, I wear one on each arm, so I can see my depth, etc., on one of them, even if the other arm is busy and the computer on that arm is at the wrong angle or something.

    2020-04-25 12.30.17.jpg
  3. Stoo

    Stoo NAUI Instructor

    # of Dives: 5,000 - ∞
    Location: Freelton & Tobermory, Ontario, Canada
    I'm not having issues, since I don't have one. However, I have trouble accessing the buttons on my Perdix, so I'm speculating. My cuffs are higher profile than yours I see. Anyway, glad it works for you!
    stuartv likes this.
  4. cib

    cib Registered

    # of Dives: 200 - 499
    Location: Qatar
    I did recent dives with my Teric and had a Perdix as my backup. Both fantastic computers but I much prefer the Teric screen. I find it easier to read, brighter and the size of the buttons was never an issue.
    delacrue96 likes this.
  5. JamesBon92007

    JamesBon92007 Contributor

    # of Dives: 2,500 - 4,999
    Location: Southern California...too far from the ocean
    @stuartv You say that as if it's common knowledge that the SAFT batteries are the new industry standard. I somehow missed all that but I chose them for my "vintage" dive computers. This is, of course, another thread but I just wanted to hear what you have to say about them before searching for an old thread or starting a new one. :)
  6. stuartv

    stuartv Seeking the Light ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Lexington, SC
    Sorry. That isn't really what I meant.

    SAFT batteries are the only battery you can use in the older Shearwater computers, like the Predator. Using a 1.5V AA alkaline was a feature added when they came out with the Petrel, I think. So, definitely not new.

    Really, I was just using SAFT battery as a shorthand way of saying a battery of the right size that has 3.6V.

    To make a computer that runs off 1 x AAA sized battery means you're starting off with a lot smaller battery than what is in a Perdix. If it's an alkaline, it will be 1.5V, and the overall energy available in a 1.5V battery that is that small would not run a Perdix for very long. At least, I think it would not be considered "long enough". So, to build a "smaller Perdix" that runs off 1 x AAA-sized battery, it would really (in my opinion) have to have a SAFT battery - i.e. my shorthand way of saying a battery the size of a AAA, but with 3.6V.

    And even that my just be showing my butt. Maybe there is tech out there to make a AAA battery with 1.5V and still have total energy comparable what one would expect from a AAA-sized 3.7V SAFT.

    So, let me back up and re-state what I meant in what I hope is a more accurate way.

    An Energizer AA battery has about 4.2W-Hr of energy. A SAFT AA (LS14500) has about 8.6W-Hr. That's why a Perdix runs so much longer on a SAFT.

    An Energizer AAA battery has about 1.8W-Hr of energy. As you can see, the smaller size results in less than 1/2 of the total energy available. 43%, actually.

    If you build a Perdix that runs on a AAA-sized battery, as you assume 30 hours run-time on an alkaline AA, then you'd be looking at 12 hours or so on an alkaline AAA. Less if you're running max brightness and AI. I don't think that is long enough to be feasible, really.

    That said, maybe if you shrank the electronics enough, it could be substantially thinner and smaller and work with 2 AAA alkaline batteries. Especially if they could source an OLED screen for it, yielding a decent reduction in power consumption at the same time.

    If you had 43% of the capacity of an AA SAFT, you'd still have 3.7W-Hr, which means it could run almost as long as a Perdix with an alkaline AA.

    But, since a AAA-sized SAFT - or some equivalent that contains a similar energy density - does not exist (that I know of), that is why I don't think a smaller, thinner Perdix, with a AAA-sized battery is feasible.
    JamesBon92007 and scrane like this.
  7. scrane

    scrane Contributor

    # of Dives: 500 - 999
    Location: Boise, ID.
    You are most likely correct in the present limitations of AAA battery technology. I don't know if the lack of a Saft AAA is a marketing consideration or a chemical one. My dream of a AAA sized Perdix is just that... a dream.
    As far as Alkaline cells go, I have ruined more electronic devices through leaking goop from Alkaline cells than I care to think about. I have pretty much switched over to Ni-MH rechargables for everything outside of my Perdix.
  8. JamesBon92007

    JamesBon92007 Contributor

    # of Dives: 2,500 - 4,999
    Location: Southern California...too far from the ocean
    So far I have not seen a consensus on which brand of batteries and considered the best replacement for such computers as the old Aladin Pro. I have read that some people have had their computer die during a dive when it said the battery was still at 40% before the dive. I chose SAFT based upon "this looks like it might be better than the other choices" kind of decision.

    BLACKCRUSADER Contributor

    # of Dives: I'm a Fish!
    Location: Taiwan
    I've never had my Perdix dive on a dive with battery even at 20%
  10. Ben_3

    Ben_3 Contributor

    # of Dives: 100 - 199
    Location: Canada
    After a lot of thinking, comparing and reviews I decided to support my local dive shop and picked up a perdix. Good thing the bill is emailed so my wife dose not stumble upon it. :coffee: :thumb2: This thing looks sweet!!

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