Petzl Duo replacement battery pack

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Petzl Duo replacement battery pack

Postby photoguy190 » Aug 1, 2012 10:37 pm

I have a old duo that I'm thinking about putting a insert in. The problem is that it has the belt pack that takes C batteries. I just can't see using this for caving. Is there any replacement battery packs that I could hook up to the the duo. If not I may sell it on ebay and go another way but would like to try.
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Re: Petzl Duo replacement battery pack

Postby NV Guide » Aug 2, 2012 12:53 pm

If you know what voltage the output is you can probably find one at battery space dot com :cavingrocks:
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Re: Petzl Duo replacement battery pack

Postby Randy88fj62 » Aug 8, 2012 10:16 am

I just saw an older model duo go for $30 on ebay. I have also seen ones with "bad conncetions" in different spots which means you can buy older ones for parts to canibalize easily. I see used ones come up every few months. Just a matter of time to find the right one at the right proce. I got my spare one for $40 used for my gf last year.
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Re: Petzl Duo replacement battery pack

Postby photoguy190 » Aug 9, 2012 9:43 pm

I was thinking of using a a holder for 18650s. I think I could wire it up in an old zoom battery box or something. My question is will this give me more battery or would I just be as well off with eneloops in a normal duo.


This is the holder I'm looking at
http://www.batteryspace.com/Battery-hol ... 20AWG.aspx
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Re: Petzl Duo replacement battery pack

Postby BenS » Aug 9, 2012 10:30 pm

I don't understand much about it, but most people recommend that you just stick with rechargeable AA batteries. Some people modify it with 18650's, but I think there is a risk of overheating and melting the plastic (correct me if I'm wrong). 18650 batteries would have better life, but I think you would have to heavily modify the duo to make them work.
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Re: Petzl Duo replacement battery pack

Postby NV Guide » Aug 9, 2012 11:14 pm

:bananabat: The best lithium ion's have 3100mAh and Eneloops are 1900.I think?
4 x 3100 = 12400 or 4 x 1900 = 7600

With the holder you linked to you don't need to buy protected batts. That will save some money, but you have to be carefull when they are used somewhere else.
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Re: Petzl Duo replacement battery pack

Postby BenS » Aug 9, 2012 11:27 pm

They make Eneloop XX that are 2500 mah and the normal ones are 2000 mah. I would love to see the completed mod and a report on it once it is done. I wanted to do it myself, but I have 0 experience with it.
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Re: Petzl Duo replacement battery pack

Postby nekid » Sep 4, 2012 12:55 pm

4x non rechargeable AA batteries 6 volt
4x rechargeable AA batteries 4,6 volt
18650 have 3,7 volt, this reduces light output and extends burn time.
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Re: Petzl Duo replacement battery pack

Postby potholer » Sep 10, 2012 12:32 pm

Voltage-wise, a lot depends on the insert that is planned for inside the Duo.

Some may be very much designed for 4.8-6V and not happy with lower voltages

Others may be happy over a range of voltages including the output of single (or parallel single) lithium-ion cells, and may even be more efficient running off 3.6V-4V power than 4.8V or 6V.

I think the latter is the case for at least some (possibly most) of the CustomDuo inserts, as well as for one of the inserts I make.
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