The DiamondClean and Sonicare 9900 Prestige series requires different chargers. Although the chargers may look the same, they are not compatible. See the table below to check if you are using the correct charger with your Sonicare Toothbrush.
|Handle Name||DiamondClean||DiamondClean Smart||DiamondClean 9000||Sonicare 9900 Prestige|
|Code on bottom of handle||HX93, HX934,|
|Code on bottom of charger base||MX9100||Type: CBA1001,|
Note: There are 2 charger models that are interchangeable and compatible across handles that use 1 of these 2 chargers: HX6110 & HX6100