Our older PowerShell (designed for our Overnight Battery) will not provide adequate charging power for our Extended Life Battery.  If you are considering purchasing our Extended Life Battery and have the older PowerShell, please visit www.hdmusa.com and hover on the Support Tab, click on PowerShell Upgrade Program and complete the form. We will process the form and provide instructions for you to ship your PowerShell to us for a firmware upgrade.  You will be responsible for the shipping cost to us.  Once we receive it in our warehouse the upgrade will be completed within 2-3 business days and shipped back to you.  The PowerShell will then be capable of providing a full charge on the Extended Life Battery.