Some things are simple for some and . ... Way too complex for others.
Batteries.. On of 'em Now I can look at an automotive type lead acid battery and tell you at a glance if it's a six or 12 volt and how to hook it up. Worked with both sixes and 12's since my teens (now lat 60s)
But ... One story here was how an RVer went to a dealer and had them put in new batteries.. WRONG.. Yup. A professional messed it up.. What more can I say.
LIkely a breaker tripped (Battery main) or the "oh-shi!!+_ fuse blue (Battery main) or the re-connect was done wrong.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times