| Description | Date | Identifier | |
| Graph showing the normal curve for a battery charge at 5.1 Amperes. | 2nd Jul 1937 | Box 164 \ 3 img037 | |
| Graph showing the discharge voltage curves for an STXR9A battery. | 1st Aug 1937 | Box 164 \ 3 img038 | |
| Battery test data sheet for a curve at 333 and 200 amperes. | 3rd Jul 1937 | Box 164 \ 3 img039 | |
| Letter from Joseph Lucas Ltd regarding a sample 12V battery and an LRT7 regulator for testing. | 6th Jul 1937 | Box 164 \ 3 img040 | |
| Cost savings and methods for lead coating battery boxes. | 6th Jul 1937 | Box 164 \ 3 img041 | |
| Customer enquiry about Gold Seal Electrolyte Batteries. | 7th Jul 1937 | Box 164 \ 3 img042 | |
| Requesting arrangements be made to test the efficacy of lead spraying on a Phantom III and Bentley battery box. | 8th Jul 1937 | Box 164 \ 3 img043 | |
| Merits and potential harm of a battery additive called 'Gold Seal Electrolyte'. | 8th Jul 1937 | Box 164 \ 3 img044 | |
| Request to order a specific Dagenite battery for the Wraith Chassis. | 3rd Aug 1937 | Box 164 \ 3 img045 | |
| Incorrect application of an acid-resisting coating on a Phantom battery box. | 17th Aug 1937 | Box 164 \ 3 img046 | |
| Arranging for the road test of two experimental lead-sprayed battery boxes on specific cars. | 17th Sep 1937 | Box 164 \ 3 img047 | |
| Fitting an ebonite-lined, acid-proof battery box to a 25/30 type car for testing. | 20th Aug 1937 | Box 164 \ 3 img048 | |
| Drawings for the Bentley 111 Battery Box and its mounting in the frame. | 15th Sep 1937 | Box 164 \ 3 img049 | |
| Requesting the purchase of terminal connectors for battery charging. | 22th Sep 1937 | Box 164 \ 3 img050 | |
| Letter from Chloride Electrical Storage Company regarding a new lid insert design for batteries. | 6th Oct 1937 | Box 164 \ 3 img051 | |
| Letter to The Chloride Electrical Storage Co. Ltd. regarding a lead insert design for batteries. | 5th Oct 1937 | Box 164 \ 3 img052 | |
| Investigation into the failure and damage of a Bentley P.& R. battery, with a suggestion for preventing future damage. | 21th Oct 1937 | Box 164 \ 3 img053 | |
| Letter from a battery supplier regarding a proposed 'lead insert' design for batteries fitted to Bentley cars. | 28th Sep 1937 | Box 164 \ 3 img054 | |
| Accompanying blueprints for the Bentley 111 Battery Box and its components. | 6th Oct 1937 | Box 164 \ 3 img055 | |
| Examination report on two faulty Dagonite (Type 6HZD9-S) batteries. | 23th Oct 1937 | Box 164 \ 3 img056 | |
| Letter from a battery manufacturer regarding a problem with two 6-HZD9-S batteries and a scheduled visit. | 25th Oct 1937 | Box 164 \ 3 img057 | |
| Return and replacement of two faulty Dagenite batteries from customer cars. | 29th Oct 1937 | Box 164 \ 3 img058 | |
| Experiment with ebonite protective coatings for battery boxes. | 9th Nov 1937 | Box 164 \ 3 img059 | |
| Order for two Wraith type batteries from Messrs. Dagenite. | 10th Nov 1937 | Box 164 \ 3 img060 | |
| Order request for two Wraith type batteries from Messrs. Dagenite. | 10th Nov 1937 | Box 164 \ 3 img061 | |
| Two 'Wraith III' Dagenite batteries, one for car 25-G-VI and one as a spare. | 12th Nov 1937 | Box 164 \ 3 img062 | |
| Arranging for a Davenset Auto Battery Charger to be obtained on loan for inspection and testing. | 18th Nov 1937 | Box 164 \ 3 img063 | |
| To hold production of parts for the Bentley III Battery Box due to a frame design change. | 18th Nov 1937 | Box 164 \ 3 img064 | |
| Inquiry regarding the use of lead paint to protect steel accumulator boxes from sulphuric acid corrosion. | 19th Nov 1937 | Box 164 \ 3 img065 | |
| Letter discussing the use of lead coating or spraying for protecting sheet steel accumulator boxes. | 22th Nov 1937 | Box 164 \ 3 img067 | |
| Corroded positive battery terminal for car 25.G.VI. | 22th Nov 1937 | Box 164 \ 3 img068 | |
| Sample STXR9A battery from Joseph Lucas Ltd. and an associated 'Sale or Return' invoice. | 24th Nov 1937 | Box 164 \ 3 img069 | |
| Letter discussing various paint and finishing options for steel battery boxes, including chlorinated rubber paint and metallic lead deposition. | 25th Nov 1937 | Box 164 \ 3 img070 | |
| Letter from the Lead Industries Development Council discussing lead spraying and coating processes. | 25th Nov 1937 | Box 164 \ 3 img071 | |
| The misallocation of batteries intended for the Experimental Department. | 30th Nov 1937 | Box 164 \ 3 img072 | |
| Letter from accumulator manufacturer Peto & Radford, discussing the results of a long-term battery test on a Bentley car. | 2nd Dec 1937 | Box 164 \ 3 img073 | |
| Technical letter discussing car battery life, issues with under-charging, and dynamo charging rates. | 2nd Dec 1937 | Box 164 \ 3 img074 | |
| Letter from Peto & Radford discussing a shift from over-charging to under-charging issues in car batteries and recommending an increase in the charging current. | 2nd Dec 1937 | Box 164 \ 3 img075 | |
| Order request for specific types of terminal connectors for battery charging. | 4th Dec 1937 | Box 164 \ 3 img076 | |
| Letter from Minchin concerning the modification of a voltage regulator. | 6th Dec 1937 | Box 164 \ 3 img077 | |
| Letter from Peto & Radford Ltd. regarding a long-term battery test and its condition after use in a Bentley. | 2nd Dec 1937 | Box 164 \ 3 img078 | |
| Technical memo discussing car battery under-charging, dynamo charging rates, and historical changes in battery technology. | 2nd Dec 1937 | Box 164 \ 3 img079 | |
| Letter discussing the shift from battery over-charging to under-charging issues, specifically regarding Bentley cars. | 2nd Dec 1937 | Box 164 \ 3 img080 | |
| Letter received from Minchin about modifying a voltage regulator. | 6th Dec 1937 | Box 164 \ 3 img081 | |
| Letter from Peto & Radford Ltd. detailing the results of a long-term battery test comparing different plate designs. | 2nd Dec 1937 | Box 164 \ 3 img082 | |
| Technical letter discussing battery under-charging issues, dynamo performance, and the evolution of battery life in cars. | 2nd Dec 1937 | Box 164 \ 3 img083 | |
| Page 3 of a letter from G.R. Minchin concerning battery under-charging issues and a recommendation to raise the charging current. | 2nd Dec 1937 | Box 164 \ 3 img084 | |
| The manufacturing of the Bentley III Battery Box, cancelling previous instructions. | 6th Dec 1937 | Box 164 \ 3 img085 | |
| Scheme for the Bentley 111 Battery Box and its mounting in the dropped frame. | 7th Dec 1937 | Box 164 \ 3 img086 | |
| Urgent issue of undercharging batteries and the need to adjust the regulator. | 8th Dec 1937 | Box 164 \ 3 img087 | |
| Confirming a battery is still undergoing testing and will be returned upon completion. | 9th Dec 1937 | Box 164 \ 3 img088 | |
| Battery conditions and experiments with sulphating and over-charging when using voltage control for dynamo output. | 15th Dec 1937 | Box 164 \ 3 img089 | |
| Car battery performance, comparing automatic and manual control, and a proposal for further testing. | 15th Dec 1937 | Box 164 \ 3 img090 | |
| Battery sulphating issues due to incorrect voltage control settings for dynamo output. | 15th Dec 1937 | Box 164 \ 3 img091 | |
| Battery performance issues with sulphation and capacity, proposing further analysis by the Experimental Department. | 15th Dec 1937 | Box 164 \ 3 img092 | |
| Internal request to order standard car batteries for experimental chassis. | 21th Dec 1937 | Box 164 \ 3 img093 | |
| Instructions for testing a standard Wraith battery box with the inside lined with thin ebonite. | 21th Dec 1937 | Box 164 \ 3 img094 | |
| The status of a pending invoice from Batteries Ltd. amounting to £15/18/11d. | 22th Dec 1937 | Box 164 \ 3 img095 | |
| Request to obtain two specific Exide batteries for experimental cars, the Phantom III and Wraith III. | 22th Dec 1937 | Box 164 \ 3 img096 | |
| Failure of three Smith's electric clocks on experimental cars, to be forwarded for repair. | 23th Dec 1937 | Box 164 \ 3 img097 | |
| Requesting two types of Dagenite batteries for comparative cold chamber tests on Wraith and Bentley electrical systems. | 31th Dec 1937 | Box 164 \ 3 img098 | |
| Arranging for the return of a battery to the makers as it cannot be tested. | 31th Dec 1937 | Box 164 \ 3 img099 | |
| Examination and review of a 'Davenset Battery Charger' submitted by the makers, Partridge and Wilson and Co. Ltd. | 3rd Jan 1938 | Box 164 \ 3 img100 | |
| Examination and report on a Davenset Battery Charger submitted by Partridge and Wilson and Co. Ltd. | 3rd Jan 1938 | Box 164 \ 3 img101 | |
| Letter to the Lead Industries Development Council discussing the effectiveness of various lead-based coatings against abrasion. | 3rd Jan 1938 | Box 164 \ 3 img102 | |
| Instruction to despatch two Wraith Battery Boxes to Rubtex Limited for painting trials. | 4th Jan 1938 | Box 164 \ 3 img103 | |
| Car battery charging issues and categorizing them into four distinct groups. | 7th Jan 1938 | Box 164 \ 3 img104 | |
| The dynamo-battery charging system, addressing charging rates and potential voltage gradients, complete with a circuit diagram. | 7th Jan 1938 | Box 164 \ 3 img105 | |
| Analysis of the vehicle's dynamo and voltage regulator performance and settings. | 7th Jan 1938 | Box 164 \ 3 img106 | |
| Dynamo and battery charging characteristics for the Phantom car. | 7th Jan 1938 | Box 164 \ 3 img107 | |
| Note detailing a four-step heating process with specific temperatures and durations. | 13th Jan 1938 | Box 164 \ 3 img108 | |
| The stoving particulars for treating Wraith battery boxes with Anti-Sulphuric Black Enamel. | 13th Jan 1938 | Box 164 \ 3 img109 | |
| Follow-up memo requesting the status of a battery type STXR9A received from Joseph Lucas Ltd. | 15th Jan 1938 | Box 164 \ 3 img110 | |
| The return of a tested Lucas battery and the decision not to purchase it. | 17th Jan 1938 | Box 164 \ 3 img111 | |
| To hold instructions for the Wraith 100 sets battery and fittings due to capacity concerns. | 18th Jan 1938 | Box 164 \ 3 img112 | |
| Letter to Peto & Radford Ltd. regarding starting issues with experimental cars due to battery performance at low temperatures. | 19th Jan 1938 | Box 164 \ 3 img113 | |
| Broken vent plug on a new Wraith battery. | 20th Jan 1938 | Box 164 \ 3 img114 | |
| Letter from a battery manufacturer regarding starting troubles at low temperatures in experimental cars. | 21th Jan 1938 | Box 164 \ 3 img115 | |
| Comparative table of battery capacity and starting effort for different types. | 21th Jan 1938 | Box 164 \ 3 img116 | |
| Internal memorandum forwarding a Works report on a faulty car battery, concluding the issue is with the car's voltage control system. | 24th Jan 1938 | Box 164 \ 3 img117 | |
| Works report on the condition of a car battery used mainly for daylight running. | 24th Jan 1938 | Box 164 \ 3 img118 | |
| Battery box modifications and battery fitment for the Wraith III model. | 26th Jan 1938 | Box 164 \ 3 img119 | |
| Order of six batteries for Wraith 6 Sets from the Exide Co. | 27th Jan 1938 | Box 164 \ 3 img120 | |
| The latest battery catalogues from various suppliers. | 31th Jan 1938 | Box 164 \ 3 img121 | |
| Letter to discuss a problem with a new type of battery that has a lack of starting current. | 31th Jan 1938 | Box 164 \ 3 img122 | |
| Request to obtain four pairs of type 'H' clamp terminal connectors for battery charging from the National Accumulator Co. Ltd. | 31th Jan 1938 | Box 164 \ 3 img123 | |
| Letter requesting the latest catalogue of car accumulators from three different suppliers. | 2nd Feb 1938 | Box 164 \ 3 img124 | |
| To 'Roy' requesting the acquisition of current battery catalogues from three listed manufacturers. | 31th Jan 1938 | Box 164 \ 3 img125 | |
| Letter from accumulator manufacturer Peto & Radford offering to visit and discuss a problem with a new battery being tested. | 2nd Feb 1938 | Box 164 \ 3 img126 | |
| Letter from The Chloride Electrical Storage Co. Ltd. enclosing a car battery catalogue. | 3rd Feb 1938 | Box 164 \ 3 img127 | |
| Letter from Joseph Lucas Limited confirming the enclosure of three copies of Publication No. 105. | 3rd Feb 1938 | Box 164 \ 3 img128 | |
| Letter from Peto & Radford of Dagenite Batteries enclosing their latest car catalogue No. C.221. | 3rd Feb 1938 | Box 164 \ 3 img129 | |
| Concerning Partridge, Wilson & Co. Ltd's desire to use the 'APPROVED BY ROLLS-ROYCE' endorsement in their advertising. | 4th Feb 1938 | Box 164 \ 3 img130 | |
| Letter to Peto & Radford Ltd. regarding battery troubles and arranging a follow-up meeting. | 5th Feb 1938 | Box 164 \ 3 img131 | |
| Scheme detailing a modification to the Wraith III battery box. | 7th Feb 1938 | Box 164 \ 3 img132 | |
| Modifications to the Wraith III battery and box to accommodate a 25/30 type battery. | 8th Feb 1938 | Box 164 \ 3 img133 | |
| Letter from an accumulator manufacturer arranging a meeting to discuss starting troubles with their batteries. | 9th Feb 1938 | Box 164 \ 3 img134 | |
| Letter to Messrs. Peto & Radford regarding the postponement of a visit. | 10th Feb 1938 | Box 164 \ 3 img135 | |
| Implications of approving the Davenset Battery Charger. | 10th Feb 1938 | Box 164 \ 3 img136 | |
| Letter from Peto & Radford to Rolls Royce regarding the arrangement of a meeting. | 12th Feb 1938 | Box 164 \ 3 img137 | |
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