Sorry I'm replying to this post so late but I've used my Kobalt 19 inch for about 18 months without incident and today the battery "popping up" issue started. Did you (or anyone else on the forum) figure out a good shim/wedging solution? I jammed a piece of cardboard (about 3 in x 1 in) down in the battery bay and it worked...until I bumped into a tree. Is there a better, more permanent solution out there? Love my mower and don't want to return it if I don't have to. Thanks in advance for any help.I have 1/3 acre. This mower is very convenient and between the Long Run (4ah) and the Quick Charge (2ah) I have no problem finishing. I had an issue today however with the battery "popping up" and not staying seated in the mower. A quick call to customer service reveals that this is a known issue, and I should either shim the battery using cardboard or a wedge or I may return the mower for a refund. I haven't decided what to do yet because I really like using this mower. New buyers might wait until the next gen.