an RNB in my XLT. Everything else I use with alkaline batteries and get exceptional battery life at a very reasonable cost.
However, in White's product list they do have part # 802-5288 for $59.95 shown as a Prizm 6T and Coinmaster GT NiCad. This would be the same battery system used in the MX5 and the eonly difference is th Prizm was a black control housing, the Coin GT burgundy, and the MX5 gray. The list I have is dated 1/2014 and the MX5 was new and it might not have been included in the product list. They charge with the Part # 509-0022 charger which lists at $24.99 [size=small](the same that was used with the XLT, DFX, MXT, M6 and Classic rechargeable NiCad battery packs)[/size].
You could also just buy AA rechargeable batteries and a charger and use your standard slide-in battery tray. I don't because you need to ask yourself how many times in a detecting season year do you really change out all 8 alkaline batteries? Do you use the detector often enough and long enough to go through a fresh pack of batteries in a short time? I usually don't because quality alkaline batteries last a long time.
If I fill the battery tray 6 times w/8-AA batteries, that would be 48 total AA's. I buy a 48 pack of quality alkaline batteries for $12.98 [size=small](or a little less)[/size] and that makes a fill-up of 8-AA alkalines batteries only cost $2.16. White's catalog states the MX5, M6 and MXT All-Pro have a battery life of 40 hours, and I am certain that using quality headphones I get a bit longer run-time than that. Still, at 40 hours for one set of quality alkaline batteries, at $2.16 a set, that only costs me 5.[size=small]4[/size]¢ per hour, so why bother with rechargeable batteries?
Just my thoughts.
[size=small]Monte[/size]