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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)
    26.8%
  2. Shearwater Perdix

    93 vote(s)
    67.4%
  3. Both of these do not suit you well

    8 vote(s)
    5.8%
  1. Marie13

    Marie13 Great Lakes Mermaid ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Great Lakes
    7,113
    5,687
    113
    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.
     
    racanichou likes this.
  2. stuartv

    stuartv Seeking the Light

    # of Dives: 200 - 499
    Location: Manassas, VA
    8,839
    4,527
    113
    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
    3,186
    3,045
    113
    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 Angel Fish

    # of Dives: 200 - 499
    Location: Qatar
    48
    10
    8
    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 Great White

    # of Dives: 2,500 - 4,999
    Location: Southern California...too far from the ocean
    3,143
    1,249
    113
    @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

    # of Dives: 200 - 499
    Location: Manassas, VA
    8,839
    4,527
    113
    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 Manta Ray

    # of Dives: 500 - 999
    Location: Boise, ID.
    1,062
    732
    113
    Stuart,
    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 Great White

    # of Dives: 2,500 - 4,999
    Location: Southern California...too far from the ocean
    3,143
    1,249
    113
    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.
     
  9. BLACKCRUSADER

    BLACKCRUSADER Barracuda

    # of Dives: 5,000 - ∞
    Location: Taiwan
    438
    261
    63
    I've never had my Perdix dive on a dive with battery even at 20%
     
  10. Ben_3

    Ben_3 Barracuda

    # of Dives: 100 - 199
    Location: Canada
    260
    99
    28
    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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