Originally Posted by
Jonnythecanuck
I did this write-up a few days ago that may be on interest.
http://www.bikeforums.net/electronic...evolution.html
I tested two different battery packs with my dynamo. One would not accept a charge at all. As mentioned above, the best way is to answer your questions is to measure the actual output. You can buy USB "power meters" to do this, but the easiest way, if you have some basic electrical skills would be to measure with a multimeter.
What's the capacity of the battery pack? (mAh) Keep in mind that if it's a large pack, it may take a long time to charge with a dynamo.
Thanks for your response from over a year ago. I am still trying to make my lightcharge device work for touring. This morning I hooked the device up to my hub and to my battery pack and the light bars lit up sequentially just like it was charging. The battery is a Rosewill lithium polymer with a capacity of 7800mAh. The instructions say it takes 15.6 hours or more depending on the charging source. From reading your previous posts, it looks like I would need a measuring device such as a multimeter to measure the battery's output to determine if the battery is accepting a charge from the dynamo charge via my USB charging device?