I've split from this thread.
http://www.rebreatherworld.com/offic...tml#post149788
Please note that the following IS NOT factory certified, but only a proven option for me in my relatively remote location.
The above detailed battery pack (in the primary) went on another shallow dive for 2 hours + 3 hours sleep mode, no manual addition so significantly heavier solenoid duty than normal.
After resting for a week, the battery pack voltage went up from 7.9 to 8.5. Did the above diving and pack depleted back down to 7.8 and is back up again to 8.3.
In summary, in the primary the parallelled dual-9V pack has done 4 hours of heavier duty than normal, and seems capable of at least another 2 hours. Pack will stay in for this coming Sundays outing.
Although this is not a long duration option, it does provide much predictability on voltage depletion. I intend to run it down to 7V, and then let it run on the bench to see how much longer it lasts. Any of you welding your own packs may find this an interesting option.
In the secondary, this pack ran for 16 hours (+~12 hrs in sleep).
In manufacturing this battery pack, the batteries are connected in parallell. This means + with + and '-' with '-'. If you connect them in series ('+' with '-') you will create an 18V pack and you will fry
your electronics.
THIS OPTION TO BE EXERCISED AT YOUR OWN RISK
In the hopes that it is useful and safe for you.