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).
List of points on why the Tungstone battery is considered inferior to other makes.
| Identifier | ExFiles\Box 35\4\ scan 197 | |
| Date | 17th September 1928 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12 24) MP 306975 X 3830 ROLLS-ROYCE LTD. INSTRUCTIONS. To: C.T.C. Order No.: J.C.128. Customer's No.: X 3830 Re Points on why the Tungstone is inferior to other makes of Batteries. The first is, being all metal it has a great weight/capacity Ratio. Each cell has to be insulated from its neighbours due to the metal case, this making the battery very bulky. Each cell having a metal lid{A. J. Lidsey} allows the cell to self discharge whilst standing, this to a much greater extent than our present std. The cells having no separators fitted have a low internal resistance & allows for plenty of acid room which is very good for starter or other heavy work, but is not necessary. The Tungstone Accumulator Co do not make any claim or state anything with regard to the life of their battery but lay great stress on their Signed: (cont'd) This Sheet must be filed on completion of the work. | ||