Fully compatible with original factory batteries -- works the same as those - Premium quality lithium battery core - Multiple levels of protective circuitry - Recharged by original factory chargers - Compatible models: DZ-MV200A 200E 208E 230A 230E 250 270A 270ENV-DS3 DS8 DS11 DS12B DS15 DS25 DS30 DS33 DS50 DS60 DS65 DS77 DS77B DS88 DS99 DS150B MX7D MX8 MX300 MX350 EX1E EX1B EX3 EX21 GS3