Bonadget2 Pack 12V 3500mAh B812-02 B812-03 Replacement Battery Compatible with Dremel 8200 8220 8300 12V Cordless Tools

Despite the negative reviews, I did not experience any problems with these batteries. No problems placing batteries into the charger, longevity life the batteries matches the original Dremel battery, and the price for two batteries are reasonable. Happy with the batteries performance so far.

These work well but seem to last a little less per charge than the original

I purchased these batteries to use on my Dremel 8240. They charge well in my charger and are good for about 20 minutes each carving coffee wood with a carbide burr. I did cut the little plastic tab off though, so it wood be easier to fit in the charger. I recommend these batteries.

Works great for my 8200. The original batteries were 1500mAh. These at 3500mAh are more than twice the capacity. I can't speak to longevity but I hope they live as long as my 8 year old originals.

I use my Dremel tool a lot every day. As a consequence I have to charge batteries fairly often. One of these batteries works well and fits perfectly in to my Dremel 8200 tool. The other battery was charged four time and on the fifth attempt to charge the battery, it wouldn't hold a charge. I like to keep two or three charged batteries so I can switch off when the battery in the tool becomes discharged. This caused a holdup in my work while another battery charged.

These are great. They work just as good as the battery that came with my dremel

I got these batteries five days ago. One has already failed after using it twice in my Dremel. I suggest that these batteries are not of good quality, with a 50% fail rate after a couple of uses.

I bought these two batteries for $31.99 on 11-21-20. I like to put price and dates in my reviews so people can see prices changes over time. This is the first off-brand cordless tool batteries that I've ever bought. They are every bit as good as the name brand Dremel battery that came with the tool. I have not had them for long, and I've been having the Dremel since 2013, so if they start losing battery time, go out prematurely, or anything else changes, I will update this review.