Those of you who don't want to use Ralph's nice trays. Before I got the trays I Velcro'd the bottom of the battery tray and used a home made shoehorn made of stiff cardboard to easily slide the batteries in then just pull out the 'shoehorn' and let the batteries settle on the Velcro. Two straps all the way around the frame, one per battery is all I used and if you are generous with the Velcro on both batteries and tray, they ain't comin' outta there... To get the batteries out, just pop them loose from below and hold them off the Velcro as you slide them out. You could also use the shoehorn method to release the batteries if you used a thin stiff material, other than cardboard for your 'shoehorn'. The shoehorn just needs to be the same width and length of your Velcro on the bottom tray.