Usually, I do not use inexpensive batteries, and I try not to use a standard or even a Heavy-Duty
labeled battery. That said, I have gone to the local Dollar Tree and bought some AA Heavy Duty when I needed to, and on once or twice I have bought their Alkaline battery, too. That was when I forgot to bring along by detector accessory/emergency parts box or when I was hunting (riding) with someone else.
Did they work? Yes, but only the alkaline batteries gave me half-decent life. They were 2-to-a-pack for $1 so it cost me $4 to fill up my XLT or XL Pro or IDX Pro, which ever I needed to get up and running at the time. The Heavy-Duty batteries didn't last as long, and at 4-for-a-$1 it still cost me $2 to fill the 8-AA battery tray.
As a rule, I shop for my battery supply at Costoc and buy their Kirkland house-brand. They
were $10.89 for a 48 pack last year so it averaged $1.81 to fill the 8-AA battery tray. At Costco a few days ago I notice they were $11-something for a 48 pack now. Still, even if it was $12 that would only be $2 to fill up with 8-AA great quality batteries.
Usually my Mom, on a tight 85 year old SS budget, usually buys me batteries for Christmas and 48 will last me about a year. (Detectors, flashlights, and 2-way radios on remote detecting trips.) Last year I had to get some office supplies at Lowes and as I walked in they had a great loss-leader display of their offshore AA alkaline batteries. Two 24 packs (48 AA alkalines) for only $6 !! They are called Utilitech, I believe, and they are Made in China, but the price was just right to help my Mom out.
I was almost out of my Kirklands, still having some on hand because the fall off the ladder last year cut some of my detecting short, I used them up and went to the Utilitech alkalines. Are they as long-lasting as the Duracell or Kirkland batteries? Well, maybe not. I'm not positive but I do know that I have been getting very good use-life out of them. As long or longer than the alkaline batteries White's supplied in their new model battery packs. And, at $6 for 48 of the, that 8-AA battery tray is filled with alkaline batteries for only $1!
Well worth the cost to me.
It pays to shop for good quality batteries. My Kirkland usually last as long or longer than the Energizers, and definitely longer than Ray-O-Vac's. Have you used the Kirkland batteries? Did you know they are made here in the USA? Do you prefer Duracell batteries, made by Proctor & Gamble (I believe)? I do ... and that's why I like the Kirkland because the same folks make those in packaging for Costco.
The cheaper, inexpensive, regular or heavy duty batteries will make the XLT work fine, for a while, if they are fresh batteries. They just won't last as long as a much better quality battery. I like to shop ahead and be prepared. In 47 years I have only been put in a pinch a few times when not prepared with good batteries on-hand. Tell your buddy to shop for quality batteries, then keep some back-ups on-hand at all times.
Monte