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need cells advice on batt pack build

Old 02-08-09, 03:47 AM
  #1  
alswiseowl
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need cells advice on batt pack build

hi there,
i plan on building a 24v 10amp nimh batt pack for my (my1018) ebike set up
ive been told that sub c cells are the way to go(true or not)???

anyway i have found a local supplier to me,that seems reasonable
they have sub c 1.2v 5200mah which seem perfect(from my inexperienced point of view)
here they are http://www.ecomputerwholesale.com.au...mj78ul8c7ps2u2 .if the link ive just tried didnt work heres a pic,Product Name: BULK LOT- Box of 24 x NiMH C Rechargable Batteries

Model Number: BATT24xC

Web URL: http://battery.beecroftsystems.com.au/

Product Price: $134.20 inc GST





hopefully that worked..

but they also supply some sub d cell at 1.2v 11000mah,here is another attemhttp://www.ecomputerwholesale.com.au/catalog/bulk-nimh-rechargable-batteries-p-5941.html?osCsid=9i0m3t205qmlmj78ul8c7ps2u2p at the link ....

the sub d cells would be easier for me to build as i only have to build in series
would these sub d cells be good for ebike**********
thanks for your time
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Old 02-11-09, 06:09 PM
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Ypedal 
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Those are no good for an ebike...

First thing is the 11,000mah rating is optimistic at best, and that would be in an FM radio or something light on power.. not high C rates like you get on an ebike.

D cell nimh, good stuff, usually is good for 8000mah ( 8ah ), there are DD cells that rate 18ah or so..

See : http://www.ebikes.ca/store/store_batteries.php
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Old 02-11-09, 06:58 PM
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riva
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C's and sub-C's are two different sizes. Like Y says plain C's are NOT designed to be drained quickly. Basically they are useless for an ebike. And like he says, that capacity rating is a load of BS. Lots of the sub-C cells are designed for high loads though, as the RC guys use them. Depending on just how fast you drain those sub-C's they may not last through many charge/discharge cycles compared with some of the other batteries. Doesn't seem like cycle life is high on the list of concerns for the RC crowd.
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