You have received suggestions of using lithium batteries and you have also received suggestions of using 10 batteries.  I have found that 10 alkaline batteries work better in my unit than 8 alkaline.  Lithium batteries are a higher voltage battery than a alkaline battery.  In other posts it has been stated that some detectors work better on 8 lithium than 8 alkaline and I think this is because of the higher voltage.  I would be concerned that a 10 pack of lithium batteries may over voltage many detectors.  Two good pieces of advice added together might equal bad advice.