Add battery_count parameter in api/batteries endpoint

[DCSBL]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.06%. Comparing base (a8e1ff4) to head (0d70d59).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #573   +/-   ##
=======================================
  Coverage   99.05%   99.06%           
=======================================
  Files           9        9           
  Lines         638      639    +1     
  Branches       51       51           
=======================================
+ Hits          632      633    +1     
  Misses          3        3           
  Partials        3        3           

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