The solar lamps have now been working for several weeks with great success: very nice light, and of course they last the whole night long even when the day is not sunny. Of course we are nearly in summer, which means that days are long, but the weather this June in Paris being really bad, on most days there is absolutely no sun, just clouds. Still all the lamps are working well. I use them mostly in “candle light” mode.
On a full 750mAh Eneloop battery, the lamps last from 24 to almost 72 hours depending on the lighting mode.