Can I charge it with 220 V??

Don't think so. Charging calls for 110v in the charger (US) Would check voltage requirement.

Is this a good replacement for dremel B814-01?

I is a great replacement for my Dremel battery pack No. 855-02.

Is this compatible with Dremel model 8260?

I have the Dremel model 8260. This battery does NOT work in this model of Dremel. It fits the charger ok and seems to charge alright but the tool absolutely will not turn on with this battery installed and charged. The info on the original battery lists the battery # as B816-01. That is not the # listed on this Hanaix.

does this work with Dremel 8250 tool?

This battery works great for the Dremel 8220 that I have. You might want to check their website and ask if its compatible with the 8250. From what I've seen it won't work. Hope this helps

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3.0Ah 12V Max Replacement Battery for Dremel B812-03 B812-02 8200 8220 8300 B812-01 Rotary Oscillating Cordless Tools for Dremel 12V Battery

3.0Ah 12V Max Replacement Battery for Dremel B812-03 B812-02 8200 8220 8300 B812-01 Rotary Oscillating Cordless Tools for Dremel 12V Battery

Product ID: 58646849

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Details

Number of Batteries
1 Lithium Ion
Brand
Hanaix
Battery Cell Composition
Other Than
Battery Capacity
3000 Hour
Recommended Uses For Product
Vacuum Cleaner

⚡12V Max Power

🔋3.0Ah High Capacity

⏱️Quick Recharge

Description

🔋 Power your precision with unstoppable energy!

FAST FLEXIBLE - Quick charge compatibility with original chargers means less waiting, more doing.
LONG LASTING CHARGE - 3.0Ah capacity ensures extended runtime, minimizing downtime and maximizing productivity.
CERTIFIED RELIABILITY - CE, FCC, PSE, RoHS certified for safety and durability that meets or exceeds OEM standards.
LIGHTWEIGHT PORTABLE - Compact design at just 168g reduces fatigue and keeps your workflow agile on the go.
POWER THROUGH PROJECTS - 12V max voltage delivers consistent, professional-grade performance for all your Dremel tools.

This 3.0Ah 12V Max rechargeable lithium-ion battery is a professional replacement for Dremel B812 and 8200-series rotary and oscillating tools. It offers quick charging, no memory effect, and long-lasting performance in a lightweight, compact design. Certified for safety and durability, it ensures seamless compatibility and reliable power for demanding projects.

Specifications

Item Dimensions	3.31 x 1.85 x 1.88 inches
Item Weight	0.17 Kilograms
Battery Weight	168 Grams
Unit Count	1 Count
Battery Cell Type	Lithium Ion
Recommended Uses For Product	Vacuum Cleaner
Reusability	Rechargeable
Battery Capacity	3000 Milliampere Hour (mAh)
Amperage	3 Amps
Voltage	12 Volts