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by susi22 3221 days ago
This one is better: http://www.thrunite.com/thrunite-c2-3400-mah-compact-portabl... I asked for old laptop batteries from my relatives/friends, so I have currently around 30 of them. I also use it a lot for my bike light and hiking light.

I bought the latest version of the C2 and it charges perfectly.