ColorMaker
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Its been a while since my last post. Can anyone recomend a quality 10mah D cell battery for building 24 volt 10a battery pack.
Jm
Jm
10mah batteries
- Thread starter ColorMaker
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Marduke
Flashaholic
You mean 10Ah (10,000mAh), right?
Also, 20 of them would give you 24v, but it would still be 10Ah capacity if the pack was entirely in series (as I suspect).
ColorMaker
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spencer
Enlightened
Do you want LSD or not?
ColorMaker
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Not required, looking for best cost
JM
JM
rmteo
Flashlight Enthusiast
$87.58 for 16pcs. - $5.47 each:
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=710
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=710
ColorMaker
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I tried them they test at 8 mah at best. I need minimum 10a
JM
JM
rmteo
Flashlight Enthusiast
What discharge rate? What cut-off voltage?
VidPro
Flashlight Enthusiast
there really isnt one, thomases sells a 13, and its good for about 10 when used at .5C when trying to draw a full 10A i always take 2 
and use 2 series sets in parelell which has the issues of proper charging when in series parelell. at 1C constant discharge all these things get pretty warm
if i rebuilt those same packs today i would certannly use the LSD and the slight loss of capacity with the better longevity and more balanced discharge over time, and the more formidable build, vrses the weakness of the higher capacity.
and use 2 series sets in parelell which has the issues of proper charging when in series parelell. at 1C constant discharge all these things get pretty warmif i rebuilt those same packs today i would certannly use the LSD and the slight loss of capacity with the better longevity and more balanced discharge over time, and the more formidable build, vrses the weakness of the higher capacity.
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ColorMaker
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The batteries are used in battery pack to power wireless controlled LED fixtures. The max current draw is 1.7 amps but I need the capacity to enable users to run the light at full power (1.7 amp) for 8 hours. We have a cutoff device in the pack to turn off the power when 1 volt (cell) is reached.
I also need to clarify the 1.7 amps. We use the 20 cells in a serial / Parralell configuration for 12 volt 20 amps. We series the cells (24 volts) for charging and parralell 2 sets of 10 in series (12 volt) to power 12 volt fixture.
JM
I also need to clarify the 1.7 amps. We use the 20 cells in a serial / Parralell configuration for 12 volt 20 amps. We series the cells (24 volts) for charging and parralell 2 sets of 10 in series (12 volt) to power 12 volt fixture.
JM
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VidPro
Flashlight Enthusiast
oops 12 not 13
http://thomasdistributing.com/shop/...html?SP_id=&osCsid=0pl7i6ecen1j46ug185en7ngv6
those things, WAY overrated, but probably falls within what your wanting, i parellel charge these at .1c for ONE series set, even if there is 2 series sets, because without doing that one set will v-drop (before the other) and then it makes a parellel series mess.
so a 1 amp max charge for a full day for the 2xparellel sets.
otherwise i use holders and charge discharge them as singles.
i also charge faster at the low end, with a voltage max charging pulse alogrythm, but when testing the end-of-charge that is what i got , going to the 2 amp for the slow charge caused major problems WHEN in the duel parellel series set. tested on the bench for days and days on end, because i depended on them to be 10amp capacity EVERYTIME i take them out.
oh and ONE was a complete DUD , el crapo, but i sorted them out before assembly
if i did it again, i would use these
http://thomasdistributing.com/shop/...html?SP_id=&osCsid=0pl7i6ecen1j46ug185en7ngv6
because they are VERY similar in capacity, and LSD, and i have not found a DUD in these pcaks, and heck the price is relative.
http://thomasdistributing.com/shop/...html?SP_id=&osCsid=0pl7i6ecen1j46ug185en7ngv6
those things, WAY overrated, but probably falls within what your wanting, i parellel charge these at .1c for ONE series set, even if there is 2 series sets, because without doing that one set will v-drop (before the other) and then it makes a parellel series mess.
so a 1 amp max charge for a full day for the 2xparellel sets.
otherwise i use holders and charge discharge them as singles.
i also charge faster at the low end, with a voltage max charging pulse alogrythm, but when testing the end-of-charge that is what i got , going to the 2 amp for the slow charge caused major problems WHEN in the duel parellel series set. tested on the bench for days and days on end, because i depended on them to be 10amp capacity EVERYTIME i take them out.
oh and ONE was a complete DUD , el crapo, but i sorted them out before assembly
if i did it again, i would use these
http://thomasdistributing.com/shop/...html?SP_id=&osCsid=0pl7i6ecen1j46ug185en7ngv6
because they are VERY similar in capacity, and LSD, and i have not found a DUD in these pcaks, and heck the price is relative.
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Power Me Up
Enlightened
As others have suggested, the Accupower D cells are good.
From my testing, I'd be surprised if you don't get at least 10 hours from a set used as you describe above.
ColorMaker
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Thank you for your input.
JM
JM
TranceAddict
Newly Enlightened
why don't you consider lead-acid or AGM battery
ColorMaker
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We also make D1210 (10 amp AGM) and a D1220 ( 20amp AGM) but our customers like the light weight and fast charge apsects of the NiMH
JM
mdocod
Flashaholic
I'd be tempted to at least look at Li-Ion and LiPo solutions as an option if weight is a major factor. You could get weight down by about 30% compared with NIMH solutions. It would be a more expensive option for sure so may not be practical at all. It would also require a lot of research into where to get quality cells from that are consistent from cell to cell and safe. A brick of 18650s or small LiPo cells would be overly complicated, they do make 20+AH rated single LiPo cells, which would cut your total number of cells down to just 3 for the whole pack. Would also require considerations for physically and electronically protecting and balancing the pack.
The above suggestion should be taken as nothing more than just me showing options, I'm not saying that this is necessarily better as I'm not fully aware of the scope of the device and it's applications.
Other idea that just popped in my head:
10xM size NIMH cells. (12V 26AH supposedly)...
( http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=4935 )
I have no experience with those cells and have never heard of anyone saying anything about them, but hey, worth a mention as it does help simplify the pack building/charging aspect as you don't have to have means to switch the pack from an all series to S/P configuration. The cost per WH would be a hair higher there than a pack built from good D cells, but other costs might come down as a result.
-Eric
The above suggestion should be taken as nothing more than just me showing options, I'm not saying that this is necessarily better as I'm not fully aware of the scope of the device and it's applications.
Other idea that just popped in my head:
10xM size NIMH cells. (12V 26AH supposedly)...
( http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=4935 )
I have no experience with those cells and have never heard of anyone saying anything about them, but hey, worth a mention as it does help simplify the pack building/charging aspect as you don't have to have means to switch the pack from an all series to S/P configuration. The cost per WH would be a hair higher there than a pack built from good D cells, but other costs might come down as a result.
-Eric
ColorMaker
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Thank you,
We already have a solid design using C and D cells we just need to find an alternate supplier for the cells.
Does Accupower have a web site ?
JM
We already have a solid design using C and D cells we just need to find an alternate supplier for the cells.
Does Accupower have a web site ?
JM
I would try the Kokam Li-po cells, maybe with built in balancers. (otherwise, you'll have to add them externally). They come in a 14.4V / 5Ah variant.
Six pieces of them could make for a 28.8V / 15Ah battery, this one will nearly last 10 hours @ 1,7A.
You could easily recharge them in less than half an hour without damage to the cells. This will, however, require a huge charger! 30 Amps! At more than 32 Volts, this will be nearly a 1000 Watts....
Lightweigt? SURE! Expensive? ABSOLUTELY Sure
Timmo.
Six pieces of them could make for a 28.8V / 15Ah battery, this one will nearly last 10 hours @ 1,7A.
You could easily recharge them in less than half an hour without damage to the cells. This will, however, require a huge charger! 30 Amps! At more than 32 Volts, this will be nearly a 1000 Watts....
Lightweigt? SURE! Expensive? ABSOLUTELY Sure
Timmo.
rmteo
Flashlight Enthusiast
I ran a test on a set of brand new Powerizer D cells. For the 2nd. conditioning cycle, I got 10595/9548mAH charge/discharge. This is charging at 3A and discharging at 3A (0.3C rate). I will do another test with discharge at 1.7A - should get a higher discharge capacity, probably close to 10AH or slightly better.
