August 31st, 2010
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