my cousin used it for his E66.
Features:
* A great way to stay in touch with beloved ones!
* Provides good talk and standby time performance to your Nokia E66.
* Stay in touch longer by getting extra battery power with a Lithium Ion Battery.
* Higher energy density than most other types of rechargeable.
* Lithium-ion batteries also have a lower self discharge rate.
* This battery gives you a longer battery life in a lighter package.
* Keep extras on hand at the office and one in a charger so you will always be powered up and ready!
* Comes with extended battery door.
* Prevents your battery covered and supports the battery firmly.
Specifications:
* Extended Battery.
* Type: Lithium Battery.
* Capacity: 2800 mAh, 3.7 V.
* Manufactured by: Mugen.
* Manufacturer Part No: HLI-E66XL.
Note:
* New Lithium Ion batterys full performance is only achieved after 2-3 complete charge and discharge cycles.
* Charge the initial 24-hour battery charge with the Smartphone turned off for best results.
* This battery is not manufactured by Nokia.