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).
Comparison of the general behaviour of P & R RR11-1 and Exide 6-RR5-2 40/50 HP standard batteries.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan189 | |
| Date | 17th March 1926 | |
| EFC. JC.15. 17.3.26. + COMPARISON OF GENERAL BEHAVIOUR OF P & R RR11-1 & EXIDE 6-RR5-2 40/50 HP. STANDARD BATTERIES. Both of these batteries were received on 16.6.24 in a fully charged condition and were put through our routine bench tests. In the case of the P & R the following results were obtained :- First a low rate discharge was taken through an invariable external resistance of 1.80 ohms and 52.8 ampere hours were realised. Then followed a high rate discharge through an invariable external resistance of .100 ohm. Initial amperes = 110.3 Time to 104 amps.= 9.4 mins. " " 100 " = 12.8 " " " 90 " = 15.4 " " " 80 " = 17.7 " A further low rate discharge was then taken and 53 ampere-hours were realised. In the case of the Exide on the 1st. low rate discharge 86.6 ampere-hours were realised and on the high rate discharge - Initial amperes = 110.0 Time to 104 amps = 11.5 mins. " " 100 " = 16.6 " " " 90 " = 21.9 " " " 80 " = 23.1 " Following this was a further low rate discharge when 80.6 ampere hours were realised. About one month after this both batteries were put on bench life test consisting of alternating overcharges and partial discharges, the P & R remaining in for 8 months | ||