Homeless Depot has got new Duracells that have 7 yrs. guaranteed Fresh on All the battery types,I just Refreshed my supply last week!I've been Reversing batteries in ALL of my lights & equipment for many,many years & I've had NO Ill effects regarding power loss or drain,I do however reverse all the batteries,whether 1 or more,& for the CR2032's Lithiums& such,I place a piece of (yellow) gas line teflon tape over the contact point,eliminating any power drain, short of water intrusion.The Main thing here though,Is to Check your equipment,Often,Regardless!