Lots of the manufacturers like to exaddurate their batteries capacities.
Addicted to yellow envelopes!--UK-- I'm a forum only moderator and not part of DX staff. To contact DX staff use: http://services.dealextreme.com New customer guide: www.tinyurl.com/help-dx
I am not an expert with lithium ion cells but MANY years ago when I was in school for electronics most manufacturers would rate batteries at something like a 20 hour discharge rate.
example: a 1000mah battery would provide 50mA for 20 hours it would not provide 500mA for 2 hours, the capacity would drop as the discharge rate increased.
I know a lot of manufacturers do overstate capacity, but I also wonder if a lower discharge rate would get numbers at least closer to claimed capacity.
as I said I am not an expert on lithium ion cells, so it is possible that they don't suffer from this condition or not as much as the older cells I dealt with, just a thought.
I bought this SKU a few times back when it was around $11 and it performed pretty close to rated in field tests with a buck/boost driver in a single-cell cree light known to pull an average of 1.2A. It got a few minutes past 2 hours with dropoff in the last ~15 minutes before the protection circuit cut in, so we estimated a 1:50hr run giving at least 2200mAh capacity.
I really hope this isn't a reduction in production quality that coincides with the price drop, because I just ordered a new pair recently.
Lead-acid batteries are indeed normally specified by their capacity from a 20 hour discharge. They suffer a lot from the Peukert effect, which means they have much less capacity when discharged faster. However Li-ion cells aren't affected anywhere near as much.
DX has found a new way to deceive customers: Use reviews for different products that have not been bought by the person who wrote the review. http://club.dx.com/forums/forums.dx/threadid.1462252
Please note that DealExtreme Forums are not a sales or product support board. While we do constantly participate in this forum, please contact us via support ticket for a guaranteed fast response. We make every effort to make the quickest replies.
Capacity not really 2400mAh???
Has anyone else found disappointing capacity on these or did I just a get some duds?
I'm a forum only moderator and not part of DX staff.
To contact DX staff use: http://services.dealextreme.com
New customer guide: www.tinyurl.com/help-dx
example: a 1000mah battery would provide 50mA for 20 hours it would not provide 500mA for 2 hours, the capacity would drop as the discharge rate increased.
I know a lot of manufacturers do overstate capacity, but I also wonder if a lower discharge rate would get numbers at least closer to claimed capacity.
as I said I am not an expert on lithium ion cells, so it is possible that they don't suffer from this condition or not as much as the older cells I dealt with, just a thought.
I really hope this isn't a reduction in production quality that coincides with the price drop, because I just ordered a new pair recently.
Use reviews for different products that have not been bought
by the person who wrote the review.
http://club.dx.com/forums/forums.dx/threadid.1462252
Very disappointed in these.
Using the Mystery Charger / Discharger sold on DX.