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Among the hidden dangers, Webb says, were four hidden high-powered batteries. "There are four extra batteries that aren't shown in the [owner's manual] diagram. They need to be serviced but you can't service them if you don't even know that they're there."

From gemcar's webpage under the service button.

Your GEM has 6 batteries - two under the hood and four under the seat. To keep batteries in good working condition, check the water level at least once a month. Remove the tops off the batteries with a flat head screwdriver to find 6 cells per battery. The water level should be 1/2-inch above the plates. Do not fill to the top of the batteries, this could cause damage to your batteries and the surrounding parts by over filling. Add distilled water only after charging unless the water level is below the top of the plates. In this case, add just enough distilled water to cover the plates, charge and then check the water level again.
Battery Level
(Caution: Always wear protective clothing, gloves, and eye protection when handling batteries.)
The GEM is NOT a maintenance free vehicle. There are certain parts of the vehicle the user is responsible to maintain. Did you know there are a total of six batteries in your vehicle, two under the hood and four under the seat? Checking water levels at least once a month is a must, and in very hot climates or under heavy use the levels should be checked more often. Using a flat head screwdriver pry off the tops of the batteries and look inside to see the water levels. If the water levels are found to be low, charge the vehicle first, then add distilled water no higher than the bottom of the neck opening (1/2 inch above plates). Overfilling will cause batteries to boil and spill onto the floor. The only time you should add water first is when the water level is below the plates. In this case add water until it covers the plates, then charge and check water levels again. Check all battery connections monthly to ensure they are tight and free of corrosion. If corrosion starts to appear wash tops and terminals of batteries with a solution of baking soda and water (1 cup baking soda per gallon of water). Let terminals dry and then spray them with anti-corrosion spray.

All this information is in the online PDF owners manual too.

Looks like Webb's open statements to the press have prolly voided any warranty and/or damage claims she might have had.