@methyl....how "dated" my advice is, depends on how "modern" the batteries are. With Li-ion batteries the need for an occasional "discharge-charge" cycle is obviated. However, since these batteries failed early and were easily replaced, they may well be Ni-MH...in which case the occasional usage cycle could be beneficial. It certainly won't harm - after all, this is a torch and was meant to be used!
Also, note that I said "low on power"...NOT "flatten". Never a good idea to completely discharge a rechargeable, I agree.