Here are some difference between Black & Decker CHV1410 and CHV1510:

CHV1510 VS CHV1410
images from manufacturer

• These 2 vacuum cleaners both come with the nickel-cadmium battery which has the “memory effect”.
• The CHV1410 has a voltage of 14.4 while the CHV1510 has 15.6 voltage.
• The CHV1410 has the power rating of 24 air watts, while it is 25 air watts on CHV1510.
• The MSRP of CHV1410 is $40 while the MSRP of CHV1510 is $45.
• The CHV1410 is in blue and white, while the CHV1510 is white gray and gray blue.