I bought a solarstorm from dongx2011 on eBay and as expected the battery is shite. I'm getting about 1hr 50mins on low.
I contacted the seller to advise of the issue and requested a partial refund of £15 as the item is not as described, its not 5000lumen for a start :), he came back with an offer of £10 or the supply of a bigger capacity battery.
I didn't see the point in getting another crap battery so took the refund so other buyers should do the same.
I'm happy with the head unit and the rear light is great but sellers shouldn't be selling crap with wild claims.