Rebreather World - View Single Post - Meg Low Battery Warning and Battery Compartment

Outlaw · 22nd September 2007, 16:22

Quote: (Originally Posted by Gilles)

Ask me a legal question, then you'll see

By connecting the batteries parallel (+ with + and - with -) you will double the charge capacity (physical equivalent of doubling the size of a cylinder). These 9V batteries have a capacity of about 625 mAH. By connecting them in parallel, it now becomes 1250mAH, still with 9V.

If you were to connect them in series (+ with -) as we do with the 5 AA cells, then you add the voltage (physical equivalent of doubling pressure to your cylinder), and you would end up with 18V, and frying the electronics.

The 5 AA in series have some 8V and some 2800 mAH capacity, so will still last twice as long as the above paralleled 9V cells. I have had welded cells fail on me during a dive, and thus have preference for something like this if it works.

It seems ok on the secondary, and I will see how it lasts and how the voltage drops with time. Depending, I'll then try on the primary.

hmm,

thanks Gilles,

especially for reassuring me that there are plenty of "stupids" around, and in different fields...

i am trying to find the link on that 9v battery. i can imagine how it would be if you can actually connect them with your way....

i'll let you know. am in the unfortunate position of formatting my pc and forgot to back up my "favorites" folder and i lost all the links i had saved before....

yeah, yeah, i know....am stupid in many "fields"...

Spyros

22nd September 2007, 16:22	#41 (permalink)
Outlaw In search of Law breaking Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2006 Location: Cyprus, Nicosia Posts: 627	Re: Meg Low Battery Warning and Battery Compartment Quote: (Originally Posted by Gilles) Ask me a legal question, then you'll see By connecting the batteries parallel (+ with + and - with -) you will double the charge capacity (physical equivalent of doubling the size of a cylinder). These 9V batteries have a capacity of about 625 mAH. By connecting them in parallel, it now becomes 1250mAH, still with 9V. If you were to connect them in series (+ with -) as we do with the 5 AA cells, then you add the voltage (physical equivalent of doubling pressure to your cylinder), and you would end up with 18V, and frying the electronics. The 5 AA in series have some 8V and some 2800 mAH capacity, so will still last twice as long as the above paralleled 9V cells. I have had welded cells fail on me during a dive, and thus have preference for something like this if it works. It seems ok on the secondary, and I will see how it lasts and how the voltage drops with time. Depending, I'll then try on the primary. hmm, thanks Gilles, especially for reassuring me that there are plenty of "stupids" around, and in different fields... i am trying to find the link on that 9v battery. i can imagine how it would be if you can actually connect them with your way.... i'll let you know. am in the unfortunate position of formatting my pc and forgot to back up my "favorites" folder and i lost all the links i had saved before.... yeah, yeah, i know....am stupid in many "fields"... Spyros __________________ CMAS - IANTD - TDI Kamikazi Instrustor Trainer DIRRebreather Team Member ---------------------------- "Once an Outlaw, always an Outlaw"
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