These 2 Black & Decker hand vacuum cleaners look very similar, however, there are some difference between them.

BDH2000FL vs FHV1200
images from manufacturer

Color
The BDH2000FL is black with a bit silver whereas the FHV1200 is white, silver, and chocolate.

Battery
The BDH2000FL uses 20V Lithium battery while the FHV1200 uses 12V Nickel Cadmium battery.

Charging Time
The BDH2000FL takes about 4 hours to recharge while the FHV1200 takes over 20 hours to fully charge.

Running Time
For a full charge, the BDH2000FL runs a bit longer than the FHV1200.

Charger
The BDH2000FL comes with a charging base while the FHV1200 has no charging base but uses a normal charger.

Accessory Storage Caddy
The FHV1200 includes an accessory caddy to store the accessories while the BDH2000FL has the accessory caddy on charging base.

Warranty
The BDH2000FL carries a 3 year limited warranty whereas the FHV1200 is backed by a 2 year limited warranty.

Air Watts
The BDH2000FL has 22 air watts versus 25 air watts on the FHV1200.

If you know other difference between FHV1200 and BDH2000FL, please share below. You can also discuss anything about these 2 vacuum cleaners by commenting below.