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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 23 May 2014 (Friday) 12:12
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Choderboy
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Jun 10, 2015 03:29 |  #16

waterrockets wrote in post #17590216 (external link)
NIMH just has such a short life though. Frustratingly so.

My 1D3 still has the original 2008 battery, and just last week it came home from a 7100 image session at 50%.

The suggestion to use 14650 LIONs would have similar capacity as NiMh. 14500s would have less.
Add 15% loss assuming the suggested regulator circuit is well designed and has 85% efficiency LION solution now has less capacity and you have an extra part to fail.
That's assuming you could somehow run the required balance charge wires inside the pack which only just fits 14mm sized cells to begin with.


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waterrockets
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Jun 10, 2015 16:15 |  #17

Choderboy wrote in post #17591129 (external link)
The suggestion to use 14650 LIONs would have similar capacity as NiMh. 14500s would have less.
Add 15% loss assuming the suggested regulator circuit is well designed and has 85% efficiency LION solution now has less capacity and you have an extra part to fail.
That's assuming you could somehow run the required balance charge wires inside the pack which only just fits 14mm sized cells to begin with.

I'm talking about the durability of the cells through years of usage cycles. In my experience, NiMH cells and packs really are not durable at all.


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Choderboy
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Jun 10, 2015 17:11 as a reply to  @ waterrockets's post |  #18

It is far more complex than comparing chemistries of cells.
See this table on Wikipedia showing max cycles of Eneloop AA NiMh, range is 500 - 3000 cycles.
and that is only 1 brand of cell. (actually 2, Panasonic make the 4th gen Eneloop)

Panasonic : •Long shelf life – batteries hold 65% charge after 5 years of storage


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johnf3f
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Jun 10, 2015 17:32 |  #19

NIMH cell certainly don't last as long as some other types, but they last longer than Lithium based cells.
For what it's worth I still have some of the Sanyo Red cells, these are Sub C size and only had an original capacity of 1200 MAH! The 8 cells that I have still hold nominal capacity and still stand discharge rates of 50 to 60 amps. Later this year it will be 30 years since I bought them!
In my usage NIMH are good for 3-5 years and Lithiums for 2 - 3 years, though there are exceptions. The newer cells are far better at storing electricity though not as long lived.


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Jun 10, 2015 18:11 as a reply to  @ johnf3f's post |  #20

Ex R/C racer John?
LION technology is changing rapidly, every few months something new developed.
I have some Sony 18650 sized high drain cells (18 of the original 20 I pulled out of cordless drill packs) still going strong since 2007.
They are good for 20 Amps, but that's 3 times the watts of a 1.2V cel.

NiCads have a bad reputation, there are many satellites orbiting the earth long after their designers predicted their demise that disagree though.


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Jun 10, 2015 18:29 |  #21

Current R/C aircraft in my case. I liked the NiCads for their reliability in receiver packs for my Gliders - but hated their small capacity! NIMH cells are far better and still better (for this use) than lithium cells - but none are quite as good (except Sanyo Eneloops) in low temperatures as the old Ni Cads due to the voltage and capacity drop. Eneloops have cured this and add capacity. I mainly fly R/C gliders and the best flying is during the winter gales when you can slap in some ballast and really get them going! It's great fun trying to get the Carbon Epoxy wings to flex! That takes come doing eg pulling VERY tight loops at 100+ mph.
As I am getting older I fly more powered aircraft (slower!) and power them with LiPo cells. They are great for capacity and can now deliver decent currents (the most I use is about 75 amps). It is noticeable in winter that they need to warm up a little before giving best performance.
I also have some cells (2000 mah NiCads) pulled from ex MOD (RAF) drill power packs from the early 1990's - still going strong!


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Jun 10, 2015 19:20 as a reply to  @ johnf3f's post |  #22

We are going off track but what the hey, I flew F3B gliders but never got into electric flight.
I live near the coast so slope soaring the F3B gliders with lot's of lead was a real buzz.
Also flew F3D and 1/2A pylon racers.


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Jun 11, 2015 11:28 |  #23

Choderboy wrote in post #17591932 (external link)
It is far more complex than comparing chemistries of cells.
See this table on Wikipedia showing max cycles of Eneloop AA NiMh, range is 500 - 3000 cycles.
and that is only 1 brand of cell. (actually 2, Panasonic make the 4th gen Eneloop)

Panasonic : •Long shelf life – batteries hold 65% charge after 5 years of storage

Ack! I just realized I was thinking of NiCad. I'm too busy this week for conversations, I guess. My apologies for leading down that path. NiMH is a brilliant technology.


1D MkIV | 1D MkIII | 550D w/grip & ML| EF 70-200mm f2.8L| EF 24-105mm f4L IS | Canon EF 100-400mm f/4.5-5.6L IS | Samyang 14mm f/2.8 IF ED UMC | 430EXii | EF 50mm f1.8

  
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Jun 11, 2015 17:52 as a reply to  @ Choderboy's post |  #24

F3F for me!


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Jun 11, 2015 19:00 |  #25

waterrockets wrote in post #17592929 (external link)
Ack! I just realized I was thinking of NiCad. I'm too busy this week for conversations, I guess. My apologies for leading down that path. NiMH is a brilliant technology.

No harm done :)

johnf3f wrote in post #17593402 (external link)
F3F for me!

Thermalling was the one aspect of model flight I never mastered, probably just too impatient.


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Jun 12, 2015 00:01 as a reply to  @ Choderboy's post |  #26

My youngest son and I are working on a discus launch glider right now, from scratch :)


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Jun 12, 2015 09:22 |  #27

Wow that's alot for a charger


olympus epl1, oly omd em10mk11, oly 14-42r x2, oly 40-150r, panasonic 25mm 1.7, gopro hero 3+ silver.

  
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Jun 12, 2015 19:38 |  #28

waterrockets wrote in post #17593820 (external link)
My youngest son and I are working on a discus launch glider right now, from scratch :)

There's a good photo op :)


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Jun 13, 2015 14:53 as a reply to  @ waterrockets's post |  #29

You will have a lot of fun - just make sure you have your camera ready!


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carloman
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Jun 16, 2015 11:51 |  #30

I have tried a few aftermarket brands and Lenmar batteries are just as good as the Canon original. Get them at amazon for $35. I get at least 800 shots sometimes 1000 depending on the circumstances per charge. I have 4 bodies so I bought 8 batteries and i go absolutely crazy in high speed shutter shooting my kids sports (hockey, swimming, and baseball)




  
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