| Description | Date | Identifier | |
| Continued letter discussing electrolyte depth, ebonite thickness, and a Phantom vehicle's side lamps. | 24th Apr 1926 | Box 54 \ 1 Scan099 | |
| Request for the return of an experimental sandwich battery from chassis 11-EX for comparative analysis. | 24th Apr 1926 | Box 54 \ 1 Scan100 | |
| Letter to Messrs. Peto & Radford discussing experiments on battery charging, potential differences, and cell construction. | 18th Jun 1926 | Box 54 \ 1 Scan101 | |
| Letter from accumulator manufacturers Peto & Radford regarding the testing of special cells and batteries. | 19th Jun 1926 | Box 54 \ 1 Scan102 | |
| Letter requesting a new 60-volt H.T. battery for testing and referring to an enclosed report on chassis battery tests. | 26th Jun 1926 | Box 54 \ 1 Scan103 | |
| Letter from a battery manufacturer discussing charging voltages and characteristics. | 6th Jul 1926 | Box 54 \ 1 Scan104 | |
| Letter discussing the true voltage of 12-volt car systems and the specification of lamps required. | 6th Jul 1926 | Box 54 \ 1 Scan105 | |
| Letter discussing the experimental testing of production batteries and their charging characteristics. | 7th Jul 1936 | Box 54 \ 1 Scan106 | |
| Vehicle electrical systems, including charging currents, lamp voltages, and cutout points. | 7th Jul 1936 | Box 54 \ 1 Scan107 | |
| Letter discussing adjustments to a dynamo cutout and ignition coil for a 6-volt battery system. | 22th Jul 1926 | Box 54 \ 1 Scan108 | |
| Test report on an S1 Sandwich Battery following a low rate discharge bench test. | 22th Jul 1926 | Box 54 \ 1 Scan109 | |
| Letter discussing the effects of running on five cells, the charging switch, and the utility of a voltmeter. | 11th Aug 1926 | Box 54 \ 1 Scan110 | |
| Letter discussing a report on the dynamo-battery electrical system and preparations for a modified dynamo. | 16th Jul 1926 | Box 54 \ 1 Scan111 | |
| Electrical department record sheet for a Petox Radford RB11-2 battery test. | 16th Jul 1926 | Box 54 \ 1 Scan112 | |
| Letter responding to an enquiry about a car's electrical system, discussing voltmeter readings, a special dynamo, and charging P.D.'s. | 30th Aug 1926 | Box 54 \ 1 Scan113 | |
| Letter discussing the Remy method of inserting field resistance and comparing it to other methods. | 31th Aug 1926 | Box 54 \ 1 Scan114 | |
| Order for an up-to-date P & R 40/50 battery for the Experimental Department. | 31th Aug 1926 | Box 54 \ 1 Scan115 | |
| Letter reporting on the performance of Exide and P&R batteries during a 10,000-mile test on a new Phantom chassis. | 2nd Sep 1926 | Box 54 \ 1 Scan116 | |
| Letter discussing issues with battery cells, including acid retention and observations from a 10,000-mile test. | 3rd Sep 1926 | Box 54 \ 1 Scan117 | |
| Letter concerning an order and improvements for a Peto & Radford battery. | 3rd Sep 1926 | Box 54 \ 1 Scan118 | |
| Letter from Peto & Radford confirming receipt of order No. 58848 for a 40/50-HP car battery. | 2nd Sep 1926 | Box 54 \ 1 Scan119 | |
| EFC to ROY requesting the latest type of Peto & Radford battery. | 7th Sep 1926 | Box 54 \ 1 Scan120 | |
| Letter from accumulator manufacturers Peto & Radford concerning battery electrolyte levels and a comparison with Exide batteries. | 7th Sep 1926 | Box 54 \ 1 Scan121 | |
| Letter discussing the construction of battery cells, specifically regarding single and double ribbed separators. | 9th Sep 1926 | Box 54 \ 1 Scan122 | |
| Letter to Messrs. Peto & Radford concerning the inclusion of battery illustrations in instruction books. | 15th Sep 1926 | Box 54 \ 1 Scan123 | |
| Letter from Peto & Radford concerning battery cells sent for testing. | 17th Sep 1926 | Box 54 \ 1 Scan124 | |
| Query about the dimensions of a supplied 40/50 battery exceeding the specification figures. | 7th Oct 1926 | Box 54 \ 1 Scan125 | |
| Extract of a letter to Peto & Radford regarding a dispute over battery height and a new 40/50 battery unit. | 9th Oct 1926 | Box 54 \ 1 Scan126 | |
| The non-interchangeable P & R batteries for the 40/50-HP Chassis due to height discrepancies. | 13th Oct 1926 | Box 54 \ 1 Scan127 | |
| Letter from a supplier about a mistake in the dimensions of battery cells for 40/50-HP models. | 11th Oct 1926 | Box 54 \ 1 Scan128 | |
| Confirming differences between P & R and Exide batteries and advising on cell replacement for the 40/50 HP Chassis. | 15th Oct 1926 | Box 54 \ 1 Scan129 | |
| Letter from accumulator manufacturer Peto & Radford concerning the bulging of a 20 HP battery case. | 20th Oct 1926 | Box 54 \ 1 Scan130 | |
| Continuation of a letter from Peto & Radford regarding components that may swell slightly. | 20th Oct 1926 | Box 54 \ 1 Scan131 | |
| Dimensional differences and assigning fault between P & R and Exide batteries. | 27th Oct 1926 | Box 54 \ 1 Scan132 | |
| Discrepancy in battery dimensions from supplier P & R for the 40/50 HP chassis. | 27th Oct 1926 | Box 54 \ 1 Scan133 | |
| Record of routine treatment for a car lighting and starting battery. | 1st Nov 1926 | Box 54 \ 1 Scan134 | |
| Log sheet detailing a battery's second charge, density readings, weight, and cell densities. | 3rd Nov 1926 | Box 54 \ 1 Scan135 | |
| Log sheet recording data from multiple battery charging cycles. | 3rd Nov 1926 | Box 54 \ 1 Scan136 | |
| 20 HP Lorraine Dietrich and a suggested improvement for Peto & Radford accumulators. | 11th May 1926 | Box 54 \ 1 Scan137 | |
| Letter from accumulator manufacturer Peto & Radford regarding modifying the electrolyte level in a battery. | 18th Nov 1926 | Box 54 \ 1 Scan138 | |
| Letter to Peto & Radford concerning battery electrolyte depth, blueprint specifications, and a dynamo output curve. | 24th Nov 1926 | Box 54 \ 1 Scan139 | |
| Letter from Peto & Radford concerning a meeting with Mr. Royce about a Lucas machine, a new battery indicator concept, and vehicle battery requirements. | 29th Nov 1926 | Box 54 \ 1 Scan140 | |
| Instructions and results for testing the recharging potential difference of a P&R RR11 battery. | 31th Jan 1927 | Box 54 \ 1 Scan141 | |
| The charging potential difference of the latest Peto & Radford battery. | 1st Feb 1927 | Box 54 \ 1 Scan142 | |
| Continuation page of a document detailing electrical charge characteristics, with mention of an attached print. | 1st Feb 1927 | Box 54 \ 1 Scan143 | |
| Graph showing sustained potential difference (P.D.) during battery charging at various currents. | 10th Aug 1927 | Box 54 \ 1 Scan144 | |
| Instruction sheet detailing the results of a re-test on a battery after a full charge. | 10th Aug 1927 | Box 54 \ 1 Scan145 | |
| Internal order request for 6 Central Stay Bolts with Nipples for a Peto & Radford battery box. | 26th Apr 1928 | Box 54 \ 1 Scan146 | |
| Extract from a letter discussing the impressive condition of a battery after two years and over 20,000 miles of use. | 15th May 1928 | Box 54 \ 1 Scan147 | |
| Extract detailing modifications to three battery cells for testing against acid leakage. | 26th Jul 1928 | Box 54 \ 1 Scan148 | |
| Letter from accumulator manufacturers Peto & Radford regarding a report on plate performance and overcoming short circuits. | 23th Aug 1928 | Box 54 \ 1 Scan149 | |
| Report from Peto & Radford detailing tests on experimental cells and proposed modifications. | 24th Aug 1928 | Box 54 \ 1 Scan150 | |
| Letter to Peto & Radford concerning a red stain observed on new wood and ebonite separators in FA.11 cells during charging. | 24th Aug 1928 | Box 54 \ 1 Scan151 | |
| Confirming the return of a battery temporarily fitted to the 10-EX vehicle. | 25th Aug 1928 | Box 54 \ 1 Scan152 | |
| Low and high rate discharge tests performed on a battery. | 2nd Nov 1925 | Box 54 \ 1 Scan153 | |
| Instructions regarding a faulty battery on a footboard and required repairs. | 28th Nov 1928 | Box 54 \ 1 Scan154 | |
| Graphical chart recording of an electrical test, possibly a battery discharge test, with calculated results. | 21th Dec 1925 | Box 54 \ 1 Scan155 | |
| Chart recording of an electrical discharge test with calculated results. | 8th Feb 1926 | Box 54 \ 1 Scan156 | |
| Chart recording of an electrical test, showing amperage over time. | 11th Jul 1924 | Box 54 \ 1 Scan157 | |
| Chart recording of an electrical test showing amperage over time, possibly for a battery. | 17th Jul 1924 | Box 54 \ 1 Scan158 | |
| Requesting correction for an improperly supported footboard on car 8-EX causing battery deterioration. | 30th Nov 1928 | Box 54 \ 1 Scan159 | |
| Electrical experimental record sheet for a P&R 2-6 RR 11-4 battery. | 21th Sep 1929 | Box 54 \ 1 Scan160 | |
| Test results for a 3-year-old P&R RR11-3 battery detailing its low and high-rate discharge performance. | 30th Sep 1929 | Box 54 \ 1 Scan161 | |
| Letter from Pritchett & Gold discussing the results of intensive life tests on various batteries. | 28th Oct 1929 | Box 54 \ 1 Scan162 | |
| Letter to E. Fowler Clark, Esq. regarding the dispatch of batteries. | 28th Oct 1929 | Box 54 \ 1 Scan163 | |
| Letter to Peto & Radford Ltd. acknowledging their correspondence about batteries and arranging delivery of a packing case. | 1st Nov 1929 | Box 54 \ 1 Scan164 | |
| Test results for a PoRRII-3 battery, detailing its performance after 43 months of bench life testing. | 8th Jul 1930 | Box 54 \ 1 Scan165 | |
| Electrical experimental record sheet for battery testing. | 19th Apr 1926 | Box 54 \ 1 Scan166 | |
| Chart recording from an electrical test showing amperes over time. | 3rd Nov 1926 | Box 54 \ 1 Scan167 | |
| Chart recording from a 'Megger' recorder showing an electrical test, possibly a battery discharge, with handwritten calculations. | 10th Nov 1926 | Box 54 \ 1 Scan168 | |
| Graph chart recording the results of a battery charge and discharge test. | 6th Jul 1927 | Box 54 \ 1 Scan169 | |
| Chart recording a battery charge and discharge test with performance data. | 8th Jul 1927 | Box 54 \ 1 Scan170 | |
| Chart recorder graph showing the results of an electrical component test. | 11th Jul 1927 | Box 54 \ 1 Scan171 | |
| Graphed record of a battery performance test, showing discharge characteristics. | 13th Jul 1927 | Box 54 \ 1 Scan172 | |
| Chart recording of an electrical component test, detailing charge and discharge characteristics. | 16th Jul 1927 | Box 54 \ 1 Scan173 | |
| Graph chart documenting an electrical test with performance data and calculations. | 1st Nov 1928 | Box 54 \ 1 Scan174 | |
| Graphical log from an electrical test showing ampere discharge over time. | 27th Sep 1929 | Box 54 \ 1 Scan175 | |
| Chart recorder graph showing results from a battery discharge test. | 5th Jul 1930 | Box 54 \ 1 Scan176 | |
| Electrical experimental record sheet for a P4RRII-3 battery, tracking tests and mileage. | 19th Apr 1926 | Box 54 \ 1 Scan177 | |
| Electrical experimental record sheet for a battery, tracking tests, dates, and mileage. | 20th Apr 1931 | Box 54 \ 1 Scan178 | |
| Routine treatment of a car lighting and starting battery. | 22th Jun 1925 | Box 54 \ 1 Scan179 | |
| Battery test report detailing charge cycles, density readings, weight, and ampere-hours. | 30th Jun 1925 | Box 54 \ 1 Scan180 | |
| Battery charging tests, detailing charge cycles, cell densities, and temperatures. | 1st Jul 1925 | Box 54 \ 1 Scan181 | |
| Form for recording the routine treatment of car lighting and starting batteries. | 22th Jun 1925 | Box 54 \ 1 Scan182 | |
| Test report detailing battery charge levels, density readings, and weight measurements. | 30th Jun 1925 | Box 54 \ 1 Scan183 | |
| Log of battery charging and performance tests, detailing current, ampere-hours, cell densities, and temperature. | 8th Jul 1925 | Box 54 \ 1 Scan184 | |
| Battery test chart comparing the voltage of R&R cells to Exide cells during discharge. | 29th Jun 1925 | Box 54 \ 1 Scan185 | |
| Test chart graphing the performance and detailing the statistics of an S1 battery. | 6th Jul 1926 | Box 54 \ 1 Scan186 | |
| Battery discharge test chart for a 'Sandwich battery S2 -E'. | 12th Aug 1925 | Box 54 \ 1 Scan187 | |
| Instructions detailing the results of bench tests on an S2 Sandwich battery. | 25th Aug 1925 | Box 54 \ 1 Scan188 | |
| Instructions regarding the voltage discharge rates of P&R and Gould battery cells. | 5th Dec 1922 | Box 54 \ 1 Scan189 | |
| Requesting an order for various battery cells and containing boxes for experiments. | 16th Nov 1925 | Box 54 \ 1 Scan190 | |
| Requesting an order for two different types of battery containing cases for testing purposes. | 19th Nov 1925 | Box 54 \ 1 Scan191 | |
| Diagram illustrating various configurations for experimental sandwich batteries. | 7th Dec 1925 | Box 54 \ 1 Scan192 | |
| Instructions for tests on a 'Sandwich' battery composed of various standard cell types. | 7th Dec 1925 | Box 54 \ 1 Scan193 | |
| High-rate discharge test and comparison of various battery types. | 5th Dec 1922 | Box 54 \ 1 Scan194 | |
| The routine treatment of a car lighting and starting battery. | 22th Mar 1926 | Box 54 \ 1 Scan195 | |
| Report page detailing battery charging, density readings, and weight measurements. | 22th Mar 1926 | Box 54 \ 1 Scan196 | |
| Log of battery charge and discharge tests, recording current, duration, cell densities, and temperatures. | 1st Apr 1926 | Box 54 \ 1 Scan197 | |
| Chart recording from a Megger instrument showing the results of a battery discharge test. | 23th Mar 1926 | Box 54 \ 1 Scan198 | |
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