The PCC for the 510, which you can find at many, many suppliers listed and referred to in this forum, works with the 4081. The only thing is that the batteries vary just a tad in length sometimes (some of them are sold as 4081 and are really DSE103 batteries, etc.), so you might want to research it just a bit and maybe even measure your batteries and make sure before you get one. I have 3 or 4 different types of batteries for the 4081, and 1 type is significantly shorter. They might not work unless you use something to take up the extra space. The best length for using with the 510 PCC is the 4081 batteries that have horizontal stripes (going around them). The ones with the lengthwise stripes are maybe 1-2 mm too long but "might" work with a tight fit. The reason for this is that the 510 PCC charges by letting the lid press the batteries into the charger. Even though I know they will charge in there if they are the right length, I haven't really done it because I don't use the 4081 much any more. (I'm awfully glad it works, though.)