| Description | Date | Identifier | |
| Log of battery charging and performance data, including cell densities and ampere-hour calculations. | 16th Dec 1921 | Box 38 \ 5 Scan181 | |
| Calculation of ampere-hours for a fifth charge. | 16th Dec 1921 | Box 38 \ 5 Scan182 | |
| Receipt and inspection of Peto & Radford batteries and samples for various car models. | 25th Nov 1921 | Box 38 \ 5 Scan183 | |
| Battery component improvements and an owner's experimental battery usage. | 25th Nov 1921 | Box 38 \ 5 Scan184 | |
| Dynamo charging rates, battery ignition, and magneto performance at different speeds. | 25th Nov 1921 | Box 38 \ 5 Scan185 | |
| List of sample battery parts from Peto & Radford Company being sent to Mr. Royce for inspection. | 26th Nov 1921 | Box 38 \ 5 Scan186 | |
| Instructions for the care and first charge of Peto & Radford accumulators. | 26th Nov 1921 | Box 38 \ 5 Scan187 | |
| Instructions for the first charge of Peto & Radford accumulators. | 2nd Dec 1921 | Box 38 \ 5 Scan188 | |
| Letter to Messrs. Peto & Radford concerning battery charging instructions and further testing. | 2nd Dec 1921 | Box 38 \ 5 Scan189 | |
| Letter from accumulator manufacturers Peto & Radford regarding observations on acid gravity during battery charging. | 9th Dec 1921 | Box 38 \ 5 Scan190 | |
| Feedback on sample P & R battery boxes, comparing 3-cell boxes to separate cells and noting insufficient lead coating. | 10th Dec 1921 | Box 38 \ 5 Scan191 | |
| Requesting the return of sample P & R cell boxes sent for Mr. Royce's inspection. | 9th Jan 1922 | Box 38 \ 5 Scan192 | |
| Letter from accumulator manufacturer Peto & Radford regarding a visit to discuss battery tests and plate performance. | 10th Jan 1922 | Box 38 \ 5 Scan193 | |
| Letter to Peto & Radford Ltd. regarding a meeting with Mr. Minchin, battery results, and sample mouldings. | 11th Jan 1922 | Box 38 \ 5 Scan194 | |
| Letter from accumulator manufacturers Peto & Radford arranging a meeting. | 26th Jan 1922 | Box 38 \ 5 Scan195 | |
| Advising of an upcoming visit from a Director of the firm Peto & Radford. | 27th Jan 1922 | Box 38 \ 5 Scan196 | |
| Battery ampere-hour efficiency and density following a visit from Mr. Preston of Peto & Radford Co. | 2nd Feb 1922 | Box 38 \ 5 Scan197 | |
| Report page discussing the reversibility of lead accumulators, temperature effects on batteries, and comparisons with nickel-iron batteries. | 2nd Feb 1922 | Box 38 \ 5 Scan198 | |
| The poor quality of batteries, specifically the De Martis battery, and a probable failure during a vibration test. | 23th Feb 1922 | Box 38 \ 5 Scan199 | |
| Letter from Peto & Radford concerning battery sizes for the 40/50 and Goshawk models. | 23th Feb 1922 | Box 38 \ 5 Scan200 | |
| Letter from Peto & Radford discussing the suitability of various battery models for different horsepower cars. | 8th Feb 1922 | Box 38 \ 5 Scan201 | |
| Price list for various Peto & Radford batteries. | 8th Feb 1922 | Box 38 \ 5 Scan202 | |
| Advance memo regarding the standardisation of a larger battery, cables, and starter motor windings for the 40/50 model. | 1st Mar 1922 | Box 38 \ 5 Scan203 | |
| Letter to Peto & Radford Co. Ltd. confirming discussions on battery modifications for the 40/50 car. | 22th Mar 1922 | Box 38 \ 5 Scan204 | |
| Selection, suitability, and modification of various battery types for the Goshawk project. | 22th Mar 1922 | Box 38 \ 5 Scan205 | |
| Page discussing the specification for battery terminals. | 23th Mar 1922 | Box 38 \ 5 Scan206 | |
| Letter from Peto & Radford discussing various battery options and specifications for the 40/50 car model. | 23th Mar 1922 | Box 38 \ 5 Scan207 | |
| Page 2 of a letter from Peto & Radford awaiting a decision from the Chief Engineer about the B.D.9. | 24th Mar 1922 | Box 38 \ 5 Scan208 | |
| Letter to Messrs. Peto & Radford regarding a decision on the B.D.11 battery for the 40/50 car. | 24th Mar 1922 | Box 38 \ 5 Scan209 | |
| The standardisation of batteries and starter motor cables for the 40/50 HP chassis. | 1st Mar 1922 | Box 38 \ 5 Scan210 | |
| Letter from accumulator manufacturers Peto & Radford concerning a sample battery terminal for a 40/50 HP car. | 1st Apr 1922 | Box 38 \ 5 Scan211 | |
| Letter to Messrs. Peto & Radford regarding battery terminals for the 40/50 Car. | 3rd Apr 1922 | Box 38 \ 5 Scan212 | |
| Letter from a battery manufacturer confirming a design change for terminal lugs. | 4th Apr 1922 | Box 38 \ 5 Scan213 | |
| Standardisation sheets for new battery and starter motor options, including a comparison of Exide and P & R batteries. | 4th Apr 1922 | Box 38 \ 5 Scan214 | |
| Standardising the larger battery, motor and cables, suggesting the matter be taken up with Mr. Royce. | 4th Apr 1922 | Box 38 \ 5 Scan215 | |
| Exide service facilities and pricing for a larger battery for the 40/50 model. | 5th Apr 1922 | Box 38 \ 5 Scan216 | |
| Return of battery components to Messrs. Peto & Radford. | 6th Apr 1922 | Box 38 \ 5 Scan217 | |
| Standardisation of larger batteries and starter motors, referencing Mr. Royce's opposing view. | 12th Apr 1922 | Box 38 \ 5 Scan218 | |
| Proposal to standardize larger batteries for the 40/50 car model. | 21th Apr 1922 | Box 38 \ 5 Scan219 | |
| Continuation of a memo advocating for the standardisation of larger batteries and motor cables. | 21th Apr 1922 | Box 38 \ 5 Scan220 | |
| Suggesting standardisation sheets for a starter motor with specific field coil windings. | 4th Aug 1921 | Box 38 \ 5 Scan221 | |
| Letter from Peto & Radford announcing the opening of new accumulator repair works in Westminster. | 1st May 1922 | Box 38 \ 5 Scan222 | |
| Pros and cons of fitting a larger battery and starter motor, and agreeing to a new armature construction method. | 16th May 1922 | Box 38 \ 5 Scan223 | |
| Standardising the battery for the 40/50 chassis, comparing Peto & Radford and Exide models. | 22th Jun 1922 | Box 38 \ 5 Scan224 | |
| Report discussing dynamo regulation, battery standards, and a proposal for a new starter motor arrangement for the Goshawk engine. | 1st Jun 1922 | Box 38 \ 5 Scan225 | |
| Technical discussion on standardizing starter motors, focusing on armature construction with and without mica plate insulation. | 22th Jun 1922 | Box 38 \ 5 Scan226 | |
| Test results for Goshawk components, a scrap matter, and standardisation sheets. | 22th Jun 1922 | Box 38 \ 5 Scan227 | |
| Letter outlining the terms for standardizing battery service, delivery, and maintenance. | 24th Jul 1922 | Box 38 \ 5 Scan228 | |
| Continued list of instructions regarding battery examination, service payments, and foreign stock. | 25th Jul 1922 | Box 38 \ 5 Scan229 | |
| Letter from Peto & Radford responding to points about standardising batteries on cars. | 25th Jul 1922 | Box 38 \ 5 Scan230 | |
| Letter from Peto & Radford regarding the suitability of their BD.11 and Goshawk batteries for Rolls-Royce cars. | 26th Jul 1922 | Box 38 \ 5 Scan231 | |
| Extract from a letter from Peto & Radford regarding battery design and a comparison with the Exide battery for a 40/50 model. | 26th Jul 1922 | Box 38 \ 5 Scan232 | |
| Page discussing a battery modification as an improvement and questioning Mr. Royce's perspective on the matter. | 25th Jul 1922 | Box 38 \ 5 Scan233 | |
| Visit to the Peto & Radford Battery Works regarding the manufacturing process for 40/50 and Goshawk batteries. | 25th Jul 1922 | Box 38 \ 5 Scan234 | |
| Comparison of P & R and Exide batteries for potential standardisation on the 40/50 and Goshawk models. | 25th Jul 1922 | Box 38 \ 5 Scan235 | |
| Comparison and recommendation of three different battery types (Exide, P & R, C.A.V.-Willard) for the Goshawk. | 25th Jul 1922 | Box 38 \ 5 Scan236 | |
| Battery selection, recommending to delete the C.A.V. Willard and retain the 6 XR3 Exide. | 1st Jul 1922 | Box 38 \ 5 Scan237 | |
| Comparing the P & R BD.11 battery to the standard, detailing differences in plate thickness, separators, and overall weight. | 27th Jul 1922 | Box 38 \ 5 Scan238 | |
| Comparison of the total weights for a standard Exide battery and a Peto & Radford BD.11 battery, including their respective boxes and fittings. | 27th Jul 1922 | Box 38 \ 5 Scan239 | |
| Letter from accumulator manufacturer Peto & Radford detailing a patented improvement to their batteries. | 19th Aug 1922 | Box 38 \ 5 Scan240 | |
| Internal memorandum discussing the standardisation of specific battery types and starter motors. | 22th Aug 1922 | Box 38 \ 5 Scan241 | |
| Cover letter forwarding correspondence received from Peto & Radford regarding batteries. | 23th Aug 1922 | Box 38 \ 5 Scan242 | |
| Standardisation sheets for batteries and starter motor components. | 4th Sep 1922 | Box 38 \ 5 Scan243 | |
| Recommendation to adopt the P & R Battery BD.11 for the 40/50 model as a simultaneous standard. | 15th Sep 1922 | Box 38 \ 5 Scan244 | |
| From EFC to Roy requesting an up-to-date price for a P & R Battery Type BD.11 for a 40/50 car. | 23th Sep 1922 | Box 38 \ 5 Scan245 | |
| The return of a signed standardisation sheet for the P & R BDll battery for the 40/50 chassis. | 30th Sep 1922 | Box 38 \ 5 Scan246 | |
| Cover memorandum attaching two previous memos to Mr. Royce regarding a P. & M. BD11 Battery for the 40/50 model. | 2nd Oct 1922 | Box 38 \ 5 Scan247 | |
| Cover letter attaching a report concerning the standardisation of larger batteries. | 21th Sep 1922 | Box 38 \ 5 Scan248 | |
| Standardization sheet for the P. & R. Battery B.D.11 for the 40/50 Chassis. | 10th Oct 1922 | Box 38 \ 5 Scan249 | |
| Revised standardisation sheet for a Peto & Radford battery for the 40/50 car. | 7th Oct 1922 | Box 38 \ 5 Scan250 | |
| Chasing a signature for the second issue of a standardisation sheet for a P & R Type BDL1 battery. | 17th Oct 1922 | Box 38 \ 5 Scan251 | |
| Unsigned Standardization Sheet for a P & R Type ED11 Battery for 40/50. | 20th Oct 1922 | Box 38 \ 5 Scan252 | |
| Peto & Radford type battery, its specifications, and alternative sources of supply. | 20th Oct 1922 | Box 38 \ 5 Scan253 | |
| Comparing different battery options and specifications for the 40/50 car model. | 23th Oct 1922 | Box 38 \ 5 Scan254 | |
| Comparison of three battery types: Exide, C.A.V., and a specially made P & R. | 23th Oct 1922 | Box 38 \ 5 Scan255 | |
| Instruction report detailing the investigation and testing of two faulty batteries. | 18th Oct 1922 | Box 38 \ 5 Scan256 | |
| Instruction sheet detailing the service history and faults of a C.A.V. Willard battery. | 18th Jun 1922 | Box 38 \ 5 Scan257 | |
| The performance and testing of a battery after running for over 27,000 miles. | 18th Oct 1922 | Box 38 \ 5 Scan258 | |
| Standardisation of a large P & R battery, declining a larger capacity in favour of improved efficiency. | 27th Oct 1922 | Box 38 \ 5 Scan259 | |
| The P & R battery for the 40/50 model and a potential halt in production. | 30th Oct 1922 | Box 38 \ 5 Scan260 | |
| Specifications and necessity of a larger P & R battery for the 40/50 model. | 30th Oct 1922 | Box 38 \ 5 Scan261 | |
| P & R batteries for the 40/50 model, discussing capacity, weight, and charging. | 11th Nov 1922 | Box 38 \ 5 Scan262 | |
| Enquiry for a simple rectifier and a disagreement on battery size. | 11th Nov 1922 | Box 38 \ 5 Scan263 | |
| Internal memorandum discussing the standardization of a new, better battery for the 40/50 model. | 7th Nov 1922 | Box 38 \ 5 Scan264 | |
| Supply and service complaints, and the standardization of batteries for the 40/50 model. | 7th Nov 1922 | Box 38 \ 5 Scan265 | |
| Peto & Radford batteries for the 40/50 chassis. | 19th Nov 1922 | Box 38 \ 5 Scan266 | |
| Copy of a letter from Peto & Radford regarding the return and exchange of sample Goshawk batteries. | 14th Nov 1922 | Box 38 \ 5 Scan267 | |
| Technical memo comparing the P & R Battery Type BD.11 to Exide batteries, detailing its construction and advantages. | 14th Nov 1922 | Box 38 \ 5 Scan268 | |
| The specifications and testing of battery components and performance, including cell cases, vents, capacity, and discharge rates. | 14th Nov 1922 | Box 38 \ 5 Scan269 | |
| Observations on the insulation resistance of a car's high-tension system. | 21th Nov 1922 | Box 38 \ 5 Scan270 | |
| Receipt and return of Peto & Radford batteries for the Goshawk model. | 14th Nov 1922 | Box 38 \ 5 Scan271 | |
| Letter from accumulator manufacturer Peto & Radford concerning the standardisation of batteries for the 40/50 car. | 14th Nov 1922 | Box 38 \ 5 Scan272 | |
| Notes on the superiority of the Peto & Radford B.D.11 battery for the 40/50 HP chassis. | 15th Nov 1922 | Box 38 \ 5 Scan273 | |
| Collection arrangements for FE P & R batteries with Messrs. Peto & Radford. | 15th Nov 1922 | Box 38 \ 5 Scan274 | |
| P. & R. battery, favouring weight reduction over increased capacity. | 10th Nov 1922 | Box 38 \ 5 Scan275 | |
| Standardisation of a P. & R. battery, its capacity, and its potential use as a second standard. | 20th Nov 1922 | Box 38 \ 5 Scan276 | |
| Requesting a comparison of the relative weight and capacity of a P & R battery versus a Chloride battery. | 20th Nov 1922 | Box 38 \ 5 Scan277 | |
| Comparison between a proposed P & R BD.11 battery and the standard Exide 6BXRE5 for the 40/50 chassis. | 21th Nov 1922 | Box 38 \ 5 Scan278 | |
| Comparison of Exide and P&R batteries, detailing weight, dimensions, efficiency, and pricing. | 24th Nov 1922 | Box 38 \ 5 Scan279 | |
| Urging the adoption of the P & R BD.11 battery for the 40/50 chassis, comparing it to the standard Exide batteries. | 23th Nov 1922 | Box 38 \ 5 Scan280 | |
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