August 31st, 2010

Using Rechargeable Batteries with the O2ptima Rebreather


Batteries are always an issue with equipment. We have recommended using only 3.6 volt lithium batteries with the O2ptima, but the Hammerheads will operate off a high quality 1.5v alkaline battery as well. As an alternative divers have asked about rechargeable batteries. I have been testing these for months and they do the job. From the charger they start at 4.0v and I can teach a class of 500 minutes of bottom time before they read 3.6v. I charge them up after that. Bench testing under load they went 10.5 hours before they couldn’t fire the solenoid. This should be worse case scenario since I pulled the sensors and it fired continuously. Divers have reported longer run times under regular diving conditions but why try to see how long they will last? It’s not worth the worry since they recharge in 30 to 50 minutes. I strongly recommend them as an alternative to non rechargeable lithium or alkaline batteries.

For more info, see Battery Junction


7 Responses to “Using Rechargeable Batteries with the O2ptima Rebreather”

  • Are those durations from cold water or warm water?

    Dave V., August 31st, 2010 at 2:55 pm

  • I have been using the unprotected type of this battery for about a year. They have worked with no problem, I used them in the Red Sea, they went at least 600min before I changed them out. I have two sets, so I can change them out, as needed. So much better than throwing away $10 on 3.6v lithium.

    Dolphi Graves, September 1st, 2010 at 12:32 pm

  • Are you recommending the protected or the unprotected version?

    Mark, September 1st, 2010 at 2:59 pm

  • What a great resource!

    CNA Training, September 8th, 2010 at 9:52 pm

  • Are you recommending the protected or the unprotected version? I looked at the web site and was not sure.

    Mark Fowler, September 9th, 2010 at 4:07 pm

  • Thanks for sharing this wonderful blog.

    courseworks, September 27th, 2010 at 3:54 pm

  • I have been using these for a while now. I find that they work very well in my O2ptima.

    I bought two sets. I can easily change out daily without ever having to wait for a set to charge.

    Howard Packer, September 29th, 2010 at 12:42 am