Battery choice for vr3

Triton · 30th June 2005, 20:27

Quote: (Originally Posted by rigdiver)

I use the Tadiran 3.6volt. I've got 30+ hours on this battery. Battery prices are nothing compared to the Rebreather and computers needed for CCR. Why take a chance over a few dollars?
Bill

I agree . But it seems some people dont think it is safe and claim to have had problems with 3.6v
Dont make sense to me why they had problems but their opinion and experience counts too.

rgds

Scuba_Vixen · 30th June 2005, 23:54

Quote: (Originally Posted by Triton)

I agree . But it seems some people dont think it is safe and claim to have had problems with 3.6v
Dont make sense to me why they had problems but their opinion and experience counts too.

rgds

I believe it's more likely related to *when* and somewhat how, they changed the battery, ot if it died while the computer was still doing tasks.

If it dies on or within 24 hours of a dive, it's still making computations. Even though you turn it off or into sleep mode after a dive, it's still figuring TTF and SI, and offgassing. Battery failure during that period probably screws up everything untill a complete cycle of dive and clear are completed.

Alkaline batteries are a lot like lead acid. They deliver a decent voltage threshold for quite q while, and then display a very obvious decline. The lights get slowly but consistantly dimmer, so to speak, before there's nothing.

Primary lithium cells are much more like NiMH. Extremely stable output voltage down to about 85%, and then it's good night Irene in a blink.

You have to keep in mind the different behaviours of the different chemisties, and manage battery maintainance/replacement accordingly.

Darlene

Pierre Farrugia · 1st July 2005, 05:19

Hello all.

Attached you can see both discharge rates for Energiser Alkaline and Lithium. You can see that the Lithium one has a more stable voltage and this is why is more recommended to electronic equipment but will give you little warning at the end of it's life!

Pics are Alkaline First

Triton · 1st July 2005, 08:28

Quote: (Originally Posted by jptaylor9)

It's not a question of saving a few dollars, or pounds in my case. It's more, what I can easily get hold of.

Hi Dude

RS components have them at a good price, delivery is fast and GRATIS for OC divers

Link is different for all countries so go to

http://www.rs-components.com/index.html

select by country and search product code 2019438

The battery is LS14500

rgds

30th June 2005, 20:27	#11 (permalink)
Triton New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jun 2005 Location: Med Posts: 39	Quote: (Originally Posted by rigdiver) I use the Tadiran 3.6volt. I've got 30+ hours on this battery. Battery prices are nothing compared to the Rebreather and computers needed for CCR. Why take a chance over a few dollars? Bill I agree . But it seems some people dont think it is safe and claim to have had problems with 3.6v Dont make sense to me why they had problems but their opinion and experience counts too. rgds
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30th June 2005, 23:54	#12 (permalink)
Scuba_Vixen e/mCCR Dolphin Pilot Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: May 2005 Location: St. Croix USVI Posts: 557	Quote: (Originally Posted by Triton) I agree . But it seems some people dont think it is safe and claim to have had problems with 3.6v Dont make sense to me why they had problems but their opinion and experience counts too. rgds I believe it's more likely related to when and somewhat how, they changed the battery, ot if it died while the computer was still doing tasks. If it dies on or within 24 hours of a dive, it's still making computations. Even though you turn it off or into sleep mode after a dive, it's still figuring TTF and SI, and offgassing. Battery failure during that period probably screws up everything untill a complete cycle of dive and clear are completed. Alkaline batteries are a lot like lead acid. They deliver a decent voltage threshold for quite q while, and then display a very obvious decline. The lights get slowly but consistantly dimmer, so to speak, before there's nothing. Primary lithium cells are much more like NiMH. Extremely stable output voltage down to about 85%, and then it's good night Irene in a blink. You have to keep in mind the different behaviours of the different chemisties, and manage battery maintainance/replacement accordingly. Darlene
(Offline)

1st July 2005, 08:28	#14 (permalink)
Triton New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jun 2005 Location: Med Posts: 39	Quote: (Originally Posted by jptaylor9) It's not a question of saving a few dollars, or pounds in my case. It's more, what I can easily get hold of. Hi Dude RS components have them at a good price, delivery is fast and GRATIS for OC divers Link is different for all countries so go to http://www.rs-components.com/index.html select by country and search product code 2019438 The battery is LS14500 rgds
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