error.html

<div class="menu">
    <div class="item" *ngFor="#unt of unitOpts" (click)="changeUnits(unt)">
        <div [innerHTML]="unt.formatted" data-tooltip="{{unt.tooltip}}" data-position="right center"></div>                                  
    </div>
</div>

produces...
browser_adapter.ts:74 EXCEPTION: Error: Uncaught (in promise): Template parse errors:
Can't bind to 'tooltip' since it isn't a known native property ("pts" (click)="changeUnits(unt)">
                                  <div [innerHTML]="unt.formatted" [ERROR ->]data-tooltip="{{unt.tooltip}}" data-position="right center"></div>                                  
"): ChartComponent@25:67

no-error.html

<div class="item" *ngFor="#unt of unitOpts" (click)="changeUnits(unt)">
    <div [innerHTML]="unt.formatted" data-tooltip="" data-position="right center"></div>
    {{unt.tooltip}}
</div>

the-fix.html

<div class="menu">
    <div class="item" *ngFor="#unt of unitOpts" (click)="changeUnits(unt)">
        <div [innerHTML]="unt.formatted" [attr.data-tooltip]="unt.tooltip" data-position="right center"></div>                                  
    </div>
</div>

ref: https://angular.io/docs/ts/latest/guide/template-syntax.html#!#attribute-binding
note: this breaks if you chant `#unt` to `let unt` 

Note: This is in 2.0.0-beta.15