The new battery fit properly and works well. It's not the same color as my old Dremel tool, but thats okay with me. Mike - Texas

This is a great battery for the dremel 770 cordless. I am going to by an extra from AMAZON. This is the 757-01 and it is the same battery in the picture on this page. Too bad these other guys had such a bad experience. This is the battery to get if you have a dremel 770 T2 cordless.

I almost passed up this item because the photo is taken at such an angle as to hide the unique shape and details of the battery! "Larger Photo" gets you a maybe 5% enlargment [being generous], and at the same quality-- the larger you make it, the worse the detail gets! It's bad enough not to know anything about sales-photos, but to be looking thru a viewfinder for a living and have no idea of shape or form? All of which leaves one with no choice but to rely on the text details of the ad.
It only lists model # 7700 as a fit, but, if it is indeed part # 757-01, then it is what came with my model-770 from the factory. But if the seller does not know what they are selling, why buy from them?
Why buy anything on an odds-OFF chance that it is what you need? Say, your wife is a perfect size 7; you buy her a size-17-something on the off-chance that it has been mis-sized? How long can you expect to stay married? What are the chances that '77 Chrysler parts will fit a '77 LTD, or vice versa?

Advice to seller: Get out of the tool business, yesterday. Better yet, get out of BUSINESS, period, and go train under someone who KNOWS what they're doing!

If the battery you want looks like this picture, don't buy this item. The picture is a 757. The item is really a 757-01, which is for a different tool and won't fit your dremel. I wasted a week and shipping costs on this mis marked product.