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).
The dismantling and condition analysis of a P & R BDL1/2 battery, focusing on cell failure due to sediment.
| Identifier | ExFiles\Box 38\5\ Scan351 | |
| Date | 9th September 1924 | |
| To EFC. JB.63. X.3398 9.9.24. X.3398- DISMANTLING OF P & R BDl1/2 BATTERY (75) The following are points observed in the dismantling of the above battery. General. Battery box in excellent condition. Cell to cell connections in excellent condition and no sign of corrosion at all. Sealing compound run over cell tops and down between cells making it a solid and good job. Interior of Cell No.4. This cell had failed owing to collected sediment in the bottom reaching up to the plates and causing partial short circuit. The negative plates were in good condition, but the paste was soft and quite firm and intact. The positive plates were in a bad condition, the paste having fallen out and being very soft had clogged itself round the plate edges and caused short circuit by being in contact with both negative and positive plates. The grids were in good condition, not being broken at all and no sign of buckling was visible but were slightly swollen. The separators were mainly in a faire condition, but were worn thin and were easily broken. No ebonite separators were fitted in this battery the wood only being used. A large amount of sediment was found in the bottom which reached up to the plates and caused short circuit. This sediment had set hard and it would have been impossible to have removed it by washing out. Cell cases are strong and durable and of moulded Dagenite. The age of this battery is 31 months. No.1 cell was later opened up but was in much the same condition For previous reports on this battery, see PB.No7,6.12.22, JB.2 31.5.23, JB.4 11.6.23, JB58, 14.8.24. EFC/GJ. This battery was one of three original P & R BDl1 batteries received, and was therefore almost certainly not pasted with the improved or harder type paste. | ||