"large battery pack"
Great lights to use in large tealight holders or hurricane lamps etc but quite a large battery pack to hide as 3 AA batteries. We put the battery pack at the base of a holder but difficult to take out to switch on without pulling on the light wire. As a result the connection has become loose and needed fixing. Just be careful when removing to switch on or change batteries.The mini ones with a smaller battery pack are probably better but much smaller in length and lights. They are still very good for lighting up containers apart from this. We use rechargeable batteries.