Or you could just buy yourself a nice sexy fx ion 7 LED!
and suffer years of misery and expense as you struggle with the dodgy contacts - flickering lights - expensive replacement parts and to boot - most of the caves you go in will seem dull and lifeless due to the flat blue light they give out.
There's nothing sexy about poorly manufactured plastic'y kit that looks like it should have come out of a xmas cracker. (but cost £120)
As for recharging them - it aint gonna happen
Best thing to do is purchase some nicads from caving supplies or some such
See
http://www.caving-supplies.co.uk/cgi-bin/psShop.cgi/add|31008||~@c~NiCad~Cells~@b|0|user|1,0,0,1|5
its the 10ah 1.2v batteries.
Caving supplies do an instruction leaflet on how to put the cells into T3 cases - It aint hard. I think the cells just slide into the two slots.
They aren't as long as an olham so if you want you can have a 'sawn-off' by cutting the case to the right length and gluing the base back on.
There are some 20 amp hour ones which are longer and fit in the full length T3 case in my old C.S catalogue but I dont know if they still have them in stock.
Then get yourself a nice trusty oldham cap lamp - tri led bulb for a backup. Nice bright halogen for throw - one happy well inluminated caver.