Quote:
Originally Posted by lutach
The only grades I know of are the ones that sit in stock for longer then expected. As far as fresh cells go, yes they'll vary in resistance and capacity a little, it happens to almost if not everything as it's hard to have two of the same exact thing made. If a pack builder gets a lot of cell, he may choose to check the resistance and capacity on all of the cells to have them match as close as they can and maybe the price increase of some brands is due to that. Now the question is, how many of the pack builders have the machines capable of doing such a job? Most materials used in the lithium battery manufacturing is as pure as 99.99% and I bet the factory will not have other production lines using 85, 90 or 95% pure material just to cut cost and have a grading sytem going. I like to wait and see what's working for everyone and if I feel the need for more lipos, I just go through the ones that are working good.
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I failed to find ANY CLUE to verify that they really do the "IR and capacity matching" job when building a pack as they claimed. I mean the big names, their triple or quad price tag that customers have to pay is only for the name, the service and much of their pocket, IMO.
Here's what I found between a cheap Turnigy 5000mAh and a big name hot product 4200mAh. These are the last 1/4 ending section of the discharge curve taken from a same charger and the packs are both brand new. Can anyone say it has tighter capacity tolenrance than the much cheaper one?
Turnigy:
a hot big name pack:
Also, at 3.2A discharge(due to 80W discharge limit of my charger) my Turnigy 5000mAh delivers 5184mAh while the big name 4200mAh delivers 4043mAh. And there come many complaint the Turnigy packs are heavier than SIMILAR RATED packs.
