Battery Discharge Rating

[mfrnfyg]

The batteries I have show a C10/10, C10/5, 1C10 and 2.2C10 rate. I understand when that a c10 for instance would be that a 5ah battery could discharge for 50 amps continuous discharge (Only to a certain dod), but what is the c10/5 or the 1C/10?

Also, the manufacture shows the discharge rate in amps Suggested minimum as follows:

EODV per cell
0.05C10 (C10/20) 1.75V
0.10C10 (C10/10) 1.70V
0.20C10 (C10/5) 1.67V
0.40C10 (C10/2.5) 1.65V
1.00C10 1.60V
2.00C10 1.55V
>5.00C10 1.50V

Obviously these would be the bare min, but the EODV for the bottom one is 1.5v per cell. That would mean the batter would be down to 9 volts.
Is this correct?
Thanks!

[Sunking]

Obviously these would be the bare min, but the EODV for the bottom one is 1.5v per cell. That would mean the batter would be down to 9 volts.
Is this correct?
Thanks!

Yep and all your loads shut off at 2.0 to 1.75 vpc, so all that energy below those voltages are not accessible.

As for the number formats they are showing is jibber jabber nonsense baby talk. Huge red flag.

[mfrnfyg]

Yep and all your loads shut off at 2.0 to 1.75 vpc, so all that energy below those voltages are not accessible.

As for the number formats they are showing is jibber jabber nonsense baby talk. Huge red flag.

Red flag?
Cyclon by Enersys are great batteries!

[Sunking]

Red flag?

Yep all this is mumbo jumbo with no meaning. Same as Baby Talk, a whole lot of nothing with no meaning.

EODV per cell
0.05C10 (C10/20) 1.75V
0.10C10 (C10/10) 1.70V
0.20C10 (C10/5) 1.67V
0.40C10 (C10/2.5) 1.65V
1.00C10 1.60V
2.00C10 1.55V
>5.00C10 1.50V

They made it all up so no one can understand. Just like a fast talking used car salesman. You know he is lying if his lips are moving.

[solar pete]

They made it all up so no one can understand. Just like a fast talking used car salesman. You know he is lying if his lips are moving.

LOL, thats almost the same as my favorite joke. How can you tell when a politician is lying? When their lips are moving.

[Sunking]

LOL, thats almost the same as my favorite joke. How can you tell when a politician is lying? When their lips are moving.

Yep but there is no difference between a polotician and a used car salesman.

What do you call a thousand politicians and lawyers drowning on a slow sinking ship in the middle of the ocean and no help within 2000 miles?

Justice or a good start.

[inetdog]

Yep but there is no difference between a polotician and a used car salesman.

What do you call a thousand politicians and lawyers drowning on a slow sinking ship in the middle of the ocean and no help within 2000 miles?

Justice or a good start.

Now don't be so antagonistic to lawyers, SK.

After all, it is just 95% of them that give all the rest a bad name.

[J.P.M.]

Now don't be so antagonistic to lawyers, SK.

After all, it is just 95% of them that give all the rest a bad name.

The difference between a dead rat lying in the road and a dead lawyer lying if the road ? The dead rat has skid marks in front of it.

[PNjunction]

Those values come from the Enersys Cyclon Application guide.

It represents the voltage values representing 100% DOD with Peukert compensation. It correlates to my own testing of Cyclons near 75F.

This is raw data, and it is up to the engineer to interpret that data, and see how it fits into his application, not just a 12v environment. It is a worst-case scenario, since most engineers aren't designing these cells to go to 100% DOD in the first place, but it's there. Amazingly, I have revived them from this 100% DOD testing many times, although that certainly did reflect in a toll being paid over time.

The constant referencing you see to "C10" in the document refers to the fact that all their data is based around a 10-hour figure, and not the more common 20-hour figure. Because these cells were designed primarily for very high current charge and discharge, the most common application would be in the single digit hours, and it would make it easier for engineers to mentalize the ah capacity based upon that 10 hour timeframe, rather than try and divide by 2 for a 20 hour timeframe, and then fudge the Peukert. In other words, this 10 hour figure made it easier to stay in the ballpark with the published testing data for the application that the Cyclons were designed for.

There are small differences, but you will see that the data in the applicaton manual closely correlates with what is in the larger flat-plate Enersys pure-lead application manual as well, also based upon the C10 timeframe.

Enersys, like the Hawker and Gates documents before them, use this C/10 10-hour figure extensively, and remind you about it often. It was kind of hard to get the 20-hour figure in print. However, as times have progressed, you may see the 20-hour figure, along with the 10-hour figure in more common consumer item charts (like the Odyssey consumer batts) since consumers are more used to comparing battery capacity based upon the 20 hour figure.

So, when you consult ANY applicaton from Enersys (or older historical documents from Hawker or Gates), note the prevalant use of the 10-hour rating.

Note too that the Cyclon's are obviously good for making odd-shaped packs, whether it is comprised of singular or monobloc cells. The singular cells have a higher valve release pressure, but this is not saying that this is an excuse to abuse them.

Anyone making packs out of individual cells or monoblocs are well advised to know what they are doing when it comes time for initial charge / balancing. Just because they are small does not mean that they should be treated with any less respect than their larger utility brethren.

Also, if for some reason you ARE taking these down beyond 50% DOD, just like their bigger flat-plate brothers, you NEED to supply them with at least 0.4C recharge current, or you will baby them down in performance each time. You may not see it immediately, but it does take a toll later on.