• Welcome to ScubaBoard


  1. Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

    Benefits of registering include

    • Ability to post and comment on topics and discussions.
    • A Free photo gallery to share your dive photos with the world.
    • You can make this box go away

    Joining is quick and easy. Login or Register now by clicking on the button

when is it time to replace a SAFT battery?

Discussion in 'Shearwater Research' started by rjack321, Aug 10, 2019.

  1. davehicks

    davehicks ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Seattle
    459
    317
    63
    I use the 14500 LiON rechargeables in my Petrels, but didn't know the work in the Predator. Is that supported?

    The great thing with the petrel is it will take nearly any AA sized battery.
     
  2. michael-fisch

    michael-fisch ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: Finally Lake City FL
    1,088
    786
    113
    I usually buy the SAFT LS14500s in quantities of 10 through Amazon pretty cheaply. Since I have 4 Shearwaters, that lasts me about 15-18 months.

    Michael
     
  3. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    16,908
    8,613
    113
    yes, a couple threads about it on here, but I've been using them for 2 years in my meg. The Predator just needs the higher voltage and the chemistry is similar with the two batteries, one just has about a third of the capacity because it's rechargeable. Long term cost though is much cheaper for the 14500's
     
  4. flymolo

    flymolo DIR Practitioner

    222
    77
    28
    @Shearwater what's the min voltage for a saft in a perdix computer?
     
  5. davehicks

    davehicks ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Seattle
    459
    317
    63
    Frequent battery changes on the Predator are a pain since it wipes tissue saturation data and memory. One Saft was usually good for a full 7--10 day dive trip, maybe not a rechargeable?
     
  6. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    16,908
    8,613
    113
    @davehicks Mine was usually good for about that long, roughly 20 hours of bottom time. Obviously a problem if you had to change mid-trip, but I never had to. If you have the second battery ready I have had about 70% chance success of swapping it quick enough and not having it lose data with the computer off.
     
  7. Shearwater

    Shearwater Dive Equipment Manufacturer

    263
    491
    63
    Jim Lapenta likes this.
  8. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
    9,778
    3,941
    113
    I'm familiar with the discharge curves on lithium batteries. I guess I was hoping for a recommended replacement voltage. I understand given the chemistry that maybe that's not possible
     
  9. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
    9,778
    3,941
    113
    I'm getting way more life out of mine. I probably have 50hrs on the current one in there.
     
  10. Shearwater

    Shearwater Dive Equipment Manufacturer

    263
    491
    63
    I'm hesitant to put in a recommended voltage, specially when it could be used for the primary ppO2 monitoring. I had a SAFT die on me while on a long dive in a 5 C (41 F) cold lake. I was able to finish the dive manually on a NERD 2 monitor. The point being that even following the 3.3 V min on my checklist I still had an event. External factors like temperature affect batteries. Divers will have to keep these into consideration.

    To further complicate matters, every now and then you encounter counterfeit SAFTs or used SAFTs sold as new. Mere voltage checking may not be enough to detect these substandard batteries. It is best to load test them like @Dsix36 mentions.
     
    tbone1004 likes this.

Share This Page