P7 batteries - how many times can they be recharged?

pastryboy
pastryboy Posts: 1,385
edited January 2010 in Commuting chat
I've got four and used two a day over the past few months. One has died completely - charger gives a green light but it does nothing in the torch. I could be imagining it but the others don't seem as bright as they were either.

They're trustfire ones - I can't find any info on the net to say how many times they can be charged.