Присвоить переменной число из кнопки

<button
    ng-click="trackEvent('Deposit', 'balance'); trackUniqueEvent('Deposit_click', 'success'); updatePeopleProfile('Deposit_click', 'now'); openDeposit()"
    class="balance-btn ng-scope"
    ns-popover=""
    ns-popover-template="new-deposit"
    ns-popover-angular-event="win-deposit"
    ns-popover-theme="ns-popover-tooltip-theme new-deposit"
    ns-popover-placement="bottom|center"
    ns-popover-timeout="360"
>
 
    <div 
       class="balance-btn-left ng-scope"
       ns-popover=""
       ns-popover-template="balance-notification"
       ns-popover-angular-event="balance-notification"
       ns-popover-theme="ns-popover-tooltip-theme push-message balance-notification"
       ns-popover-placement="bottom|center"
       ns-popover-timeout="360"
       ng-class="{pending: pendingDeposits.count > 0}"
    >
        <i class="icon-spt deposit"></i>
        <span id="user-balance">
            <span class="counter ng-binding">0.01406</span>
            mBTC
        </span>
      
    </div>
 
    <div class="balance-btn-right">
        <span>
            <i class="icon-spt deposit-plus"></i>
        </span>
    </div>
 
</button>