Good point- apparently there have been a few "incidents" lately even in decent mods... We just don't want to hear about them in the news. Sometimes a battery malfunctions internally on its own. The Reo has some safety build into it, including the collapsible spring, but really- getting the right/safer battery could save you from injury... Make sure as one precaution, you allow the Reo to do its safety thing- allows the spring to collapse in the case of a hard-short...if it's already compressed from the get-go, you are asking for trouble if something does go wrong (and it has- my Grand's spring collapsed from a bad atty)- Thank God for the Reo Spring!!!