Epoxy is the wrong type of glue to use when you're dealing with these plastic trays from Eflite. I remember from my Cirrus that the plastic inside the battery compartment was very smooth and slippery, most likely has some teflon content. If you are having trouble with keeping the tray down, I would suggest you rough up the side that is to be glued to the planes floor with sandpaper. Use FoamTac instead and do the apply FT, press on to spread the glue all over the mating surface, pull off and let air get at both sides for 1/2 minute, press back on, repeat till it gets really tacky, then leave it be for overnight. You shouldn't have to repeat more than 3 times before it gets difficult to pull it off. Once it's on for the final time, you can use hot glue and squeeze a line of it along the edges of the tray to help with wedging it down. When you do up the velcro around the battery, don't pull up on the velcro. Push the battery down onto the tray as you do up the velcro.
Worse case scenario, ditch the tray altogether and FoamTac a piece of velcro onto the floor where you want the battery to go. Then FoamTac the other matching side velcro to the battery, BUT, only use a small piece (about an inch) at each end of the battery so you can easily detach it. The velcro can be the type with the peel off paper backing. FoamTac over the sticky stuff. It doesn't take much to hold the battery down. Even a 2200, 4s battery doesn't weight that much unless you decide you're going to do outside loops all day long.
I never had a battery comes loose on my Cirrus and I flew that thing like a crazy person at times.
Worse case scenario, ditch the tray altogether and FoamTac a piece of velcro onto the floor where you want the battery to go. Then FoamTac the other matching side velcro to the battery, BUT, only use a small piece (about an inch) at each end of the battery so you can easily detach it. The velcro can be the type with the peel off paper backing. FoamTac over the sticky stuff. It doesn't take much to hold the battery down. Even a 2200, 4s battery doesn't weight that much unless you decide you're going to do outside loops all day long.
I never had a battery comes loose on my Cirrus and I flew that thing like a crazy person at times.










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