Do you have to use the floor mounting kit?

No. The Laveo Dry Flush can be placed on any level surface indoors or out. Make sure the surface supports the toilet and toilet does not become unstable. Tipping generally does not cause waste spillage. however, if you are planning to use the toilet within a vehicle or any moving unit or if you just want it to stay secure on the ground, the Quick Mounting Kit is designed to secure your unit.

How do you get more flush cartridges and what kind of battery are we talking about?

You can get more cartridges for the Laveo Dry Flush toilet on our website. The battery in the toilet is a 12V 7Ah Sealed Lead Acid Battery.
https://www.shoptinyhouses.com/collections/dry-flush/products/dry-flush-refill-cartridges-3-pack.

Does this require electric

The Laveo Dry Flush only needs electricity to recharge the battery that is in the unit.The battery will last for several months, depending upon weather and for at least 300 flushes before charging is needed.

Approximately how many flushes until the cartridge is full and needs to be disposed of?

The Laveo Dry Flush Cartridges last for about 15-17 flushes each.

where do you dispose of the used cartridges when they are full?

The sealed cartridges are designed to be disposed of in the trash bin.

Does this toilet come with any bags or do those need to be purchased separately?

This unit comes with 2 (two) refill cartridges.

How do you know when bag is full? How easy is it to change cartridge? How many bags in each cartridge?

The Laveo Dry Flush Portable Toilet refill cartridges have 15-17 flushes in them. Some people do not flush after every use. Some with urinate in it multiple times before hitting the flush button. We recommend flushing after every bowel movement. You will be able to tell when the cartridge is about to run out as a red line will appear on the material when there are two flushes left. If you ignore the indicator, the material will run out in the next flush or two, and the top edge of the material will be visible. It is very easy to replace the cartridge. When the cartridge is expended, lift up the toilet seat and the trim piece just under it. Lift out the liner bag containing wrapped waste. Then you simply put a new liner and install the new cartridge. 

What is the maximum weight of the individual who will use the Laveo? Do you make it in a larger size?

According to the manufactuer, the Dry Flush has a 500 pound user weight capacity. The Dry Flush only comes in one size.

what comes with this? Battery? Charger, Cables?

It comes with the toilet which will have the battery pre-installed. It also comes with the charger to plug into a standard wall outlet and 2 cartridges (1 pre-installed in the toilet).

I want to use the toilet on a vacation property I have. I would only use the toilet two or three times in a weekend, since the bags have 15 plushies how many weeks or months can I go without any type of smell or odor from the previous flushes? Not trying to use it three times in a weekend and having to throw away all the other bags that could get pricey?

Yes you can go without emptying out the bags. The bags seal at each flush and that prevents the smell or odor appear with previous flushes.

Can the batteries come off to recharge elsewhere or is it fully connected?

You can remove the battery from the Dry Flush and recharge it elsewhere. You simply unplug the battery cable from the Dry Flush and pull the battery out.

Is there any lingering odor?

No there shouldn't be lingering odor.

What is the warranty on this

The Warranty on Laveo Dry Flush is 1 year manufacturing and 6 months on components. 

are the bags biodegradable

No, the bags are not biodegradable. 

Do you choose to flush or is it automatic?

When you are ready to flush, you push a button the the Laveo Dry Flush to flush. 

What is the manufacturer's warranty on this product??

For the Laveo Dry Flush it is is 1 year on the toilet and 6 months on the components.