| Description | Date | Identifier | |
| Battery configurations, comparing the use of two 12-volt batteries in parallel against Mr. Royce's scheme of two 6-volt batteries in series. | 30th Dec 1927 | Box 168b \ 3 img011 | |
| Difficulties with the Phantom's two-unit battery installation and frame. | 6th Mar 1928 | Box 168b \ 3 img012 | |
| Extract from a letter regarding access to cells for topping up without removing the rear unit. | 8th Mar 1928 | Box 168b \ 3 img013 | |
| The accessibility, maintenance, and charging of car batteries. | 23th Mar 1928 | Box 168b \ 3 img014 | |
| Issues with the accessibility of batteries on experimental cars. | 8th May 1928 | Box 168b \ 3 img015 | |
| Specification for a 40/50 HP chassis lighting and starting battery in two 6-volt units. | 22th Aug 1928 | Box 168b \ 3 img016 | |
| Specifications for a battery, including overall dimensions, testing procedures, and cell layout. | 22th Aug 1928 | Box 168b \ 3 img017 | |
| Specifications for battery terminals, connections, sealing compound, and plate grids. | 22th Aug 1928 | Box 168b \ 3 img018 | |
| Specification document detailing requirements for battery separators, plate spacing, and electrolyte management. | 22th Aug 1928 | Box 168b \ 3 img019 | |
| Continued page of specifications for car batteries, covering acid level inspection, vibration resistance, and potential for neglect. | 2nd Sep 1929 | Box 168b \ 3 img020 | |
| Comparison of P & R RRN.11 and Exide 3 RRS-12L 6-volt unit batteries. | 2nd Sep 1929 | Box 168b \ 3 img021 | |
| Technical comparison of P&R and Exide battery components including negative plates, separators, and cell covers. | 2nd Sep 1929 | Box 168b \ 3 img022 | |
| Report page detailing the construction and materials of P & R covers, links, and nuts for a battery or electrical cell. | 2nd Sep 1929 | Box 168b \ 3 img023 | |
| Report suggesting improvements to battery design, comparing P & R and Exide types, specifically regarding plates and separators. | 20th Dec 1929 | Box 168b \ 3 img024 | |
| Routine treatment and testing record for car lighting and starting batteries. | 20th Dec 1929 | Box 168b \ 3 img025 | |
| Battery test report detailing the second charge, with cell readings, weight, and temperature measurements. | 7th Jan 1930 | Box 168b \ 3 img026 | |
| Log sheet detailing battery cell performance tests, including density, voltage, and cadmium readings. | 7th Jan 1930 | Box 168b \ 3 img027 | |
| Battery test data from fourth and fifth charge cycles, with readings for P&R and Exide cells. | 20th Jan 1930 | Box 168b \ 3 img028 | |
| Test report on the charging potential difference of P&R and Exide standard 6-volt unit batteries. | 20th Jan 1930 | Box 168b \ 3 img029 | |
| Battery corrosion on the Phantom II Chassis due to insufficient ventilation. | 24th Jan 1930 | Box 168b \ 3 img030 | |
| Battery corrosion issues on the Phantom II chassis. | 28th Jan 1930 | Box 168b \ 3 img031 | |
| Causes of battery corrosion on the Phantom II chassis and potential solutions. | 3rd Feb 1930 | Box 168b \ 3 img032 | |
| Note on preventing battery corrosion through material choice, protective coatings, and ventilation. | 4th Feb 1930 | Box 168b \ 3 img033 | |
| Slight corrosion on batteries for the Phantom II chassis. | 4th Feb 1930 | Box 168b \ 3 img034 | |
| Causes of battery corrosion on the Phantom II chassis. | 7th Feb 1930 | Box 168b \ 3 img035 | |
| Improvements to battery cell covers and terminal glands to mitigate corrosion. | 7th Feb 1930 | Box 168b \ 3 img036 | |
| Proposing a modification to the handle slots of 6-volt unit batteries for the Phantom II chassis. | 26th Feb 1930 | Box 168b \ 3 img037 | |
| Proposed modification to Phantom II batteries to facilitate carrying by elongating the slots. | 27th Feb 1931 | Box 168b \ 3 img038 | |
| Letter to The National Accumulator Co. Ltd. regarding suggestions for lead-coated brass inserts and ebonite adhesion. | 26th Feb 1930 | Box 168b \ 3 img039 | |
| Letter to The National Accumulator Co. Ltd. regarding battery cell lid modifications and comparative testing of 6-volt units. | 26th Feb 1930 | Box 168b \ 3 img040 | |
| Cancelling a requirement for a 20 HP battery and ordering two modified 6-volt Phantom II battery units from different suppliers. | 27th Feb 1930 | Box 168b \ 3 img041 | |
| Letter from an accumulator company regarding a drawing of a cell lid and proposed alterations. | 27th Feb 1930 | Box 168b \ 3 img042 | |
| Letter from an electrical storage company confirming points discussed regarding battery component modifications. | 28th Feb 1930 | Box 168b \ 3 img043 | |
| Letter from Chloride Electrical Storage Company discussing agreements on battery container material and price reductions. | 1st Mar 1930 | Box 168b \ 3 img044 | |
| Letter to The National Accumulator Co. Ltd. regarding a misunderstanding with the Chloride Co. over battery supplies. | 1st Mar 1930 | Box 168b \ 3 img045 | |
| Follow-up actions from a visit by Mr. McKinnon of The Chloride Co. regarding batteries for 20 HP and Phantom II models. | 30th Mar 1930 | Box 168b \ 3 img046 | |
| Letter from The Chloride Electrical Storage Company following up on particulars for Phantom II chassis batteries. | 4th Mar 1930 | Box 168b \ 3 img047 | |
| Letter from the National Accumulator Company Ltd. requesting a confirming order for a special unit. | 6th Mar 1930 | Box 168b \ 3 img048 | |
| Letter to The Chloride Electrical Co. Ltd. regarding Phantom II Chassis Batteries. | 6th Mar 1930 | Box 168b \ 3 img049 | |
| Letter from accumulator manufacturer Peto & Radford concerning blueprints for lid designs. | 10th Mar 1930 | Box 168b \ 3 img050 | |
| Letter to Chloride Electrical Storage Co. Ltd. regarding Phantom II chassis batteries and blue prints from the National Accumulator Company. | 11th Mar 1930 | Box 168b \ 3 img051 | |
| Letter to The National Accumulator Co. Ltd. concerning an order and forwarding blueprints for review. | 11th Mar 1930 | Box 168b \ 3 img052 | |
| Cover letter to The Chloride Electrical Storage Co. Ltd enclosing two prints. | 12th Mar 1930 | Box 168b \ 3 img053 | |
| Letter acknowledging receipt of correspondence regarding Phantom II Chassis Batteries, noting that the prints were missing. | 12th Mar 1930 | Box 168b \ 3 img054 | |
| Letter from The Chloride Electrical Storage Company acknowledging receipt of a letter and blueprints. | 14th Mar 1930 | Box 168b \ 3 img055 | |
| Letter chasing comments and suggestions on blueprints for Phantom II Chassis Batteries. | 9th Apr 1930 | Box 168b \ 3 img056 | |
| Letter from a battery supplier defending their design choices for Phantom II chassis batteries. | 10th Apr 1930 | Box 168b \ 3 img057 | |
| Page two of a letter from Chloride Electrical Storage Company regarding cell specifications. | 11th Apr 1930 | Box 168b \ 3 img058 | |
| Design of cell lids, comparing Chloride and P & R designs. | 11th Apr 1930 | Box 168b \ 3 img059 | |
| Letter to The National Accumulator Co. Ltd. regarding the design of cell lids for Phantom II chassis batteries. | 24th Apr 1930 | Box 168b \ 3 img060 | |
| Page 2 of a letter to The National Accumulator Co.Ltd. regarding a suggested design improvement for a plate. | 24th Apr 1930 | Box 168b \ 3 img061 | |
| Letter from the National Accumulator Company regarding the testing of cell lids and plate designs. | 28th Apr 1930 | Box 168b \ 3 img062 | |
| New stiffener for the battery box anchorage on the 40-50 HP chassis. | 29th Apr 1930 | Box 168b \ 3 img063 | |
| Notification regarding a modification to handle slots, referencing previous production instructions. | 5th May 1930 | Box 168b \ 3 img064 | |
| Letter from the National Accumulator Company regarding design alterations to accumulator plates and lids. | 5th May 1930 | Box 168b \ 3 img065 | |
| Letter to The National Accumulator Co. Ltd regarding the ongoing comparative tests between two batteries. | 8th May 1930 | Box 168b \ 3 img066 | |
| Request for battery specifications for the 40-50 HP and 20/25 HP chassis. | 8th May 1930 | Box 168b \ 3 img067 | |
| Confirming the dispatch of battery specifications for the 20/25 and 40/50 models. | 3rd May 1930 | Box 168b \ 3 img068 | |
| Recent modifications to standard Phantom 6-volt unit batteries. | 9th Jul 1930 | Box 168b \ 3 img069 | |
| Modifications to battery plates and moulded ebonite containers to prevent short-circuiting and improve handling. | 1st Jul 1930 | Box 168b \ 3 img070 | |
| Details on modifications to connecting links, battery vents, and connections. | 9th Jul 1930 | Box 168b \ 3 img071 | |
| Continued report on experimental testing and proposed modifications for Exide and P&R batteries. | 9th Jul 1930 | Box 168b \ 3 img072 | |
| Requesting an order for P & R and Exide 6-volt batteries for comparative testing. | 1st Sep 1930 | Box 168b \ 3 img073 | |
| Comparison of charging voltages for P&R and Exide batteries under varying temperature conditions. | 30th Sep 1930 | Box 168b \ 3 img074 | |
| Graph of terminal potential difference vs. rate of charge for Paragon and Exide 6-volt batteries at various temperatures. | 19th Jun 1930 | Box 168b \ 3 img075 | |
| Graph comparing the sustained potential difference of P&R and Exide 6-volt batteries during charging. | 22th Jan 1930 | Box 168b \ 3 img076 | |
| Test report on a P&R & Exide N.S.I. battery, detailing performance and component modifications. | 23th Oct 1930 | Box 168b \ 3 img077 | |
| Report comparing the capacity and performance of P&R and Exide units during a high rate discharge test. | 30th Oct 1930 | Box 168b \ 3 img078 | |
| Improved moulded Dagenite vent for the Standard Phantom II battery. | 30th Oct 1930 | Box 168b \ 3 img079 | |
| Extract discussing the design and sourcing of a battery, considering Dagonite and Exide options. | 15th Sep 1926 | Box 168b \ 3 img080 | |
| From EFC to Roy regarding an order for batteries from the Exide Co. for the S.S. chassis. | 18th Apr 1929 | Box 168b \ 3 img081 | |
| Letter to The Chloride Electrical Storage Co. Ltd. requesting a battery cell for inspection due to failures. | 2nd Jul 1929 | Box 168b \ 3 img082 | |
| Letter from a supplier proposing the supply of a 6-volt monobloc battery for the 40/50 HP chassis. | 4th Jul 1929 | Box 168b \ 3 img083 | |
| Letter to The Chloride Electrical Storage Co.Ltd., confirming their proposal is satisfactory. | 5th Jul 1929 | Box 168b \ 3 img084 | |
| Letter to The Chloride Electrical Storage Co. Ltd. about the inspection of a sample moulded container and cell. | 10th Sep 1929 | Box 168b \ 3 img085 | |
| Letter to Chloride Electrical Storage Co.Ltd. regarding a change in design for a terminal stud. | 10th Sep 1929 | Box 168b \ 3 img086 | |
| Inspection and subsequent return of a sample Exide 6-volt battery unit. | 26th Sep 1929 | Box 168b \ 3 img087 | |
| Letter to Chloride Electrical Storage Co. Ltd regarding the return of a sample ebonite container and requesting new sample grids. | 26th Sep 1929 | Box 168b \ 3 img088 | |
| The order of two different 6-volt batteries for a direct comparison test. | 26th Sep 1929 | Box 168b \ 3 img089 | |
| Letter from The Chloride Electrical Storage Company acknowledging a request for sample grids and noting the return of a sample container. | 28th Sep 1929 | Box 168b \ 3 img090 | |
| Letter from The Chloride Electrical Storage Company regarding modifications to battery plate moulds and terminal studs to prolong battery life. | 9th Oct 1929 | Box 168b \ 3 img091 | |
| Letter to Chloride Electrical Storage Co. Ltd. agreeing to modifications for the RR Exide standard cell. | 14th Oct 1929 | Box 168b \ 3 img092 | |
| Examination of sample unpasted grids for an Exide 3-RRS-IEL battery, including plate dimensions. | 25th Nov 1927 | Box 168b \ 3 img093 | |
| Description of the construction and design of positive and negative battery grids. | 25th Nov 1927 | Box 168b \ 3 img094 | |
| The design and dimensions of positive and negative battery plates. | 25th Nov 1927 | Box 168b \ 3 img095 | |
| Design considerations for grids, including capacity loss and corner radius. | 6th Dec 1929 | Box 168b \ 3 img096 | |
| Experimental record sheet tracking the mileage and performance of an Exide battery. | 6th Dec 1929 | Box 168b \ 3 img097 | |
| Experimental record sheet for an Exide 3RRS-IEL-1 battery test. | 6th Dec 1929 | Box 168b \ 3 img098 | |
| Comparison of modifications and performance between P & R and Exide N.S.1. battery cells. | 3rd Jan 1930 | Box 168b \ 3 img099 | |
| Letter proposing a modification to the handle slots of 6-volt batteries for the Phantom II chassis. | 27th Jan 1930 | Box 168b \ 3 img100 | |
| Letter to The Chloride Electrical Storage Co. regarding modifications to battery fitments on experimental cars. | 27th Jan 1930 | Box 168b \ 3 img101 | |
| Letter regarding a proposed modification for 6-volt unit batteries for the Phantom II Chassis. | 29th Jan 1930 | Box 168b \ 3 img102 | |
| Letter to The Chloride Electrical Storage Co. regarding modifications for 6-volt batteries on the Phantom II chassis. | 13th Feb 1930 | Box 168b \ 3 img103 | |
| Letter from Chloride Electrical Storage Company regarding 6-Volt batteries for the Phantom II Chassis. | 14th Feb 1930 | Box 168b \ 3 img104 | |
| Letter concerning the design of 6-volt unit batteries for the Phantom II chassis, specifically cell connections. | 15th Feb 1930 | Box 168b \ 3 img105 | |
| Letter from a battery supplier requesting a print for a part related to the Phantom II Chassis battery. | 19th Feb 1930 | Box 168b \ 3 img106 | |
| Letter to The Chloride Electrical Storage Co. regarding a suggestion for Phantom II chassis batteries. | 21th Feb 1930 | Box 168b \ 3 img107 | |
| Letter from a battery supplier regarding Phantom II chassis batteries and a competitor's drawing. | 22th Feb 1930 | Box 168b \ 3 img108 | |
| Test report on an Exide 3RRS-1EL-3-4 battery's performance and condition after road use. | 19th Mar 1930 | Box 168b \ 3 img109 | |
| Confirmation of receipt for a faulty Exide 3.RES-IEL 6-volt unit battery with burnt cell to cell connections. | 27th Mar 1930 | Box 168b \ 3 img110 | |
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