I would stay away from rechargeable lithium cells and go with simple 1 AA alkaline or NiMH cell lights. Around this time of year Lowes and Home Depot carry large packs of AA cells for around 20 cents apiece. I buy one and it lasts me a couple of years. No worries about running lithium cells down to an unsafe level. NiMH eneloops or Ikea cells if you prefer, also safe. Occasionally single AA lights running “Cree XPE” (?) go on sale for cheap on banggood or gearbest.