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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter from Peto & Radford discussing battery charging currents and the potential for over or undercharging.

Identifier  ExFiles\Box 54\1\  Scan057
Date  27th November 1925
  
PETO & RADFORD. CONTINUATION 4.


E.{Mr Elliott - Chief Engineer} Fowler Clark Esq., 27th November 1925.


is 80 ampere hours; normal charging current 8 amperes. It is a 50% bigger battery yet the charging current is almost the same, and on these figures it would appear that either one battery is overcharged or else the other is undercharged.

You will remember that we asked you to reduce the charging current on the 20 h.p. by one ampere and you did do so a long time ago and you were rather nervous then as to whether it would get under-charged. It would be interesting to know if you did get any complaints since this was done, and if you did not, I think you might consider giving it a bit further reduction as I think you are a long way from receiving complaints of that sort. I dont think we have ever had an under-charged battery off a Rolls Royce car.

Over-charging means more frequent necessity to top up the battery with water. A job that is always shirked, and if that is not done as often as it should, that again curtails the life of the battery.

I am afraid you will think I am an awful nuisance continually returning to this point, but if the batteries are over-charged we are the people who are going to get the blame and I am anxious for the very best thing possible to be done, consequently I want to get to the bottom of this with you if you do not mind, and am awfully keen that you shall have everything the best possible.


Yours sincerely,

G.R.N. Minchin
  
  


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