We both got in trouble for simple battery.

I think this technology will continue to improve over time giving more battery power and additional capabilities.Even the less expensive brands have worked well in our communities, I guess we will see how they compare over the next few years.

Batteries last for years and I've never had one fail.

To change batteries remove the screw.  2 years with no issues.

Tenant agrees to comply with all duties required by Wyoming Statute §1-21-1204: maintain the Premises in clean and safe condition and not unreasonably burden any common area; dispose of all garbage and other waste; maintain all plumbing fixtures in a condition as sanitary as the fixtures permit; use all electrical, plumbing, sanitary, heating, and other facilities and appliances in a reasonable manner; prevent water pipes from freezing by turning off outside spigots, disconnecting hoses, and keeping the rental heated to at least 50 degrees; replace lightbulbs, air filters, water filters, and other consumables as needed; test smoke detectors every six months and replace batteries as needed; immediately notify Agent in writing of any defects or dangerous conditions Tenant becomes aware of; replace broken or cracked glass, no matter the circumstance of breakage, unless the Tenant provides Agent with a police report detailing breakage beyond the control of Tenant; pay to repair anything damaged by the Tenant, his guests or invitees, whether through intentional act or negligence; upon termination, remove all personal property and garbage either owned or placed on the Premises by Tenant and clean the Premises to the condition at the beginning of the AgreementCreate a policy and stick to it.

Take a look at Reno, it's is a solid area for rentals because of the limited new construction, tech and manufacturing jobs moving to the area (Tesla, Apple, Switch etc.) along with the lithium loop of mining and recycling to manufacturing batteries and vehicles.  

I like that they have built-in solar panels and batteries to power the home in the event of a Grid-down sitaution.My concern would be: will they be valued as manufactured homes are?

No unregistered vehicles and no vehicle repair on property is in the lease (although I wouldn't have a problem with emergency battery and tire situations, I prefer they don't change the oil on the property. 

Tenants that always call about everything are a pain, but tenants that never call are even worse for your bottom line.2) Replace smoke alarm batteries.

Honda has broken ground on the new battery plant out there, and you'll be able to keep an eye on your first investment