On two separate occasions, my car almost stalled.  The engine lugged starting out from a stop. The Maintenance Req'd light came on.  Apparently, this light is strictly for oil changes.  That is what I was given to understand.

Then I checked my battery connection.  The 1/8 cable exposure was aged and frayed, so it could be the battery cable.  Richard, Stupid Richard pointed me to the corrosion build up on the battery and he proceeded to get hot water and pour it all over the corrosion.  It did seem to dissolve the corrosion a little.

Then a friend says 

Corrosion is easy to clear up.  Not hot water.  Very bad.  Use a tablespoon of baking soda in 8 ounces of water, mix thoroughly until clear, brush over all areas of corrosion, and wipe off residue with a rag. Be sure to wear rubber gloves.

Then he ads

Then he ads  Go to Wal-Mart.  Buy a red or black cable, depending on positive or negative.  Follow the cable to where it bolts to whereever it bolts to.  Usually a 9/16 wrench or socket, unscrew it. Remove terminal at other end from battery.  Take new cable and reverse process.  20 minutes.   

That was as clear as mud.  I'll need to buy a new battery cable.

https://www.amazon.com/gp/aw/s/ref=is_s_ss_i_0_13?k=battery+cable&sprefix=battery+cable



This presentation may be better.  Went to start the car and all we got was that "click" in the engine bay.  Dialectric tune-up grease?

What is wrong with Richard?

Richard no longer does decent service; in fact, it's indecent.  It's corruptible.  I had work done here on 3 separate cars.  I've recommended him to family, who actually liked his service. If you are Chinese and a woman, Richard might give you good service. Being a regular customer does not mean anything any more. Money today flows too easily.  Lots of Mercedes Benz ad Lexuses drive into his garage where he can earn $500 a car any time of the day or week.  But his business scruples have absolutely fallen apart.  Over the course of 20 years he is now burning me on price and on service.  I get my oil changed, assuming that my filter is also changed, only to find out that my car takes an additional 2 quarts of 20/50 oil one week after he changes it.  He doesn't have to like me; that's not what I am expecting.  But I am expecting ethical service. If I bring my car in, I expect it to be serviced as promised.  Richard no longer does this with me.  And I found similar responses online at Yelp.  I wished I had known.  Still, if you're Chinese, he might give you good service.