If you want battery, Axa Greenline or Cateye GVolt (not Volt) look like the best bets to me. Lidl had some OK own-brand ones (40 lux on high, so slightly brighter than my Pico, although only 2.5h on that brightness) for £10 a few weeks ago but I bet they've all sold out by now.
Bright enough for anyone and comes with rechargeable battery, http://www.ebay.co.uk/itm/Solarstor...267942?hash=item3d0673f5e6:g:obEAAOSwz2lXBYPN
Battery life seems to be a casualty of a combination of built-in batteries and the modern fetish for using high lumen ratings to overcome naff lenses, with 2-3 hours seeming fairly common now. If you're willing to cut it fine with a 20 lux mode (really the lower limit for seeing on wet, dark country roads IMO), then you can double that. Compare that to the early countryside-ready 20 lux LED headlights which used pairs of removable C or AA cells and do 10 hours between recharges of 2000mAh batteries - it's the main reason I still have a near-antique held together with tape on my folding bike.some interesting options here, what is the average battery life? 1-2 hours may not be enough for her... I am trying to find out her journey lengths