You own a Windows 10 laptop or tablet, then better find out how good your battery is...

In both cases you can get the information about your battery (especially if you want to replace it) using the power configuration command as in:
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C:\Users\powercfg /?
You get the help for power configuration as shown here:
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C:\Users\Jayaram>powercfg /?
POWERCFG /COMMAND [ARGUMENTS]
Description:
  Enables users to control power settings on a local system.
  For detailed command and option information, run "POWERCFG /? "
Command List:
  /LIST, /L          Lists all power schemes.
  /QUERY, /Q         Displays the contents of a power scheme.
  /CHANGE, /X        Modifies a setting value in the current power scheme.
  /CHANGENAME        Modifies the name and description of a power scheme.
  /DUPLICATESCHEME   Duplicates a power scheme.
  /DELETE, /D        Deletes a power scheme.
  /DELETESETTING     Deletes a power setting.
  /SETACTIVE, /S     Makes a power scheme active on the system.
  /GETACTIVESCHEME   Retrieves the currently active power scheme.
  /SETACVALUEINDEX   Sets the value associated with a power setting
                     while the system is powered by AC power.
  /SETDCVALUEINDEX   Sets the value associated with a power setting
                     while the system is powered by DC power.
  /IMPORT            Imports all power settings from a file.
  /EXPORT            Exports a power scheme to a file.
  /ALIASES           Displays all aliases and their corresponding GUIDs.
  /GETSECURITYDESCRIPTOR
                     Gets a security descriptor associated with a specified
                     power setting, power scheme, or action.
  /SETSECURITYDESCRIPTOR
                     Sets a security descriptor associated with a
                     power setting, power scheme, or action.
  /HIBERNATE, /H     Enables and disables the hibernate feature.
  /AVAILABLESLEEPSTATES, /A
                     Reports the sleep states available on the system.
  /DEVICEQUERY       Returns a list of devices that meet specified criteria.
  /DEVICEENABLEWAKE  Enables a device to wake the system from a sleep state.
  /DEVICEDISABLEWAKE Disables a device from waking the system from a sleep
                     state.
  /LASTWAKE          Reports information about what woke the system from the
                     last sleep transition.
  /WAKETIMERS        Enumerates active wake timers.
  /REQUESTS          Enumerates application and driver Power Requests.
  /REQUESTSOVERRIDE  Sets a Power Request override for a particular Process,
                     Service, or Driver.
  /ENERGY            Analyzes the system for common energy-efficiency and
                     battery life problems.
  /BATTERYREPORT     Generates a report of battery usage.
  /SLEEPSTUDY        Generates a diagnostic connected standby report.
  /SRUMUTIL          Dumps Energy Estimation data from System Resource Usage Monitor (SRUM).
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One of the arguments is 'batteryreport'.
Now if you type as shown here:
--
C:\Users\Jayaram>powercfg /batteryreport
Battery life report will get saved to C:\Users\Jayaram\battery-report.html.

Type as shown below, the HTML file will be launched in a browser.
C:\Users\Jayaram>battery-report.html
C:\Users\Jayaram>

Your battery report is saved to a html file.  This file is launched when you run the command, battery-report.html as above.
Here is the generated file (only partly shown):

These are the main sections in the report:

Battery details
Installed Batteries
Recent Usage
Battery Usage
Usage History
Battery Capacity History
Battery Life Estimates

It may be interesting to run this file once in 3 months and keep a record. When you are not using you can switch off (for long expected durations of inactivity), or let it sleep (for shorter durations of inactivity). Adjust your battery saver settings in Windows 10 Settings.

@travel: You do not need to buy TESLA in India, MahindraReva's e02 will do

 

 MahindraReva has entered second generation with e02 all electric cars that use lithium-ion batteries. The first generation car had lead acid battery. Here is a picture of the lead acid battery car of my neighbour who is quite satisfied with its performance. He seems to get 80Km with a single charge. I asked him what if the car stops in the middle due to battery (which lost its charge) and he smiled and said he calculates where he is going and he has no problem. He has been using it for a couple of years.

e02 is second generation with two models one basic(T0) and one premium(T2) both 4 seater cars and and the base starts at 4.82 lakhs and premium at 6.82 lakhs.e20 site is here:
http://www.mahindracarsindia.com/car/Mahindra-E20

Here is a picture from Mahindra's site.I have seen a couple of them running the city (Bengaluru). You can get 120Km out of a single charge. It is sold in many Indian cities, Bhutan and Bermuda (Island car).

http://mahindrareva.com/news-and-reviews/press-coverage

 e02 comes in 6 different colors: Spanish Red, Arctic Silver; Eco Green; sunfire yellow; coral blue and Oceanic white.

I think this is perfect for Honolulu, Hawaiian Islands and the smaller US cities.

There are both free and paid charging stations are available in many cities and Bengaluru has some 98 stations. The owners will have their own charging setups. While it takes 5 hours for full charging at your home set up(15a/220V), it can be charged in about an hour using it's Quick2Charge technology. The battery lasts for 50000 Kms and can be leased.

Full specifications are available here:
http://mahindrareva.com/product/specifications





1 lakh is 100,000
US $1 = 63.5 Rs
1 Km = 0.6214 miles