The reason we don't is three fold.
1) Batteries are heavy and expensive to ship, hazmat concerns also come into play.
2) The safety connector we offer allows a lot of versatility such as solar panels or changing batteries, using disposable or rechargeable batteries and scaling the battery up to meet the needs of the end user. For example a greenhouse frag operation could run with just solar and heavy duty batteries and completely run off the grid.
3) Batteries are one of those things that a price break is only possible in enormous volumes, we really could not buy a battery for much less than you can at a battery store, the economics of including the battery also just don't pan out.