This AOPEN 1849-G Replacement Battery Pack is 100% compatable with the BTP-56E3 AOPEN 1849-G Replacement Battery Pack. Our batteries and accessories are made with high quality parts and are guaranteed to meet or exceed the original equipment manufacturers specifications at a reduced price. All batteries are tested for 100% quality control assurance. This AOPEN 1849-G Replacement Battery Pack includes a warranty to guarantee that it has no manufacturing defects.