Drydex Battery T20

• Marke: Exide

Cylindrical Zinc Carbon "D" Cell. Utility Flashlight (Torch) battery from 19th Century. About 6000mAH at low current drain (25mA). Varies from 1.7V (fresh, no load) to 0.9V (Exhusted).

Transistor Radio sets commonly use 4 for 6V. Some models may use 2 or 6. LT for battery valves use 1 (or 2 in parallel) for "Personal" sets and some 1950s models used 5 in series for 7.5V nominal or 6 for a radio with RF preamp. Many LT or Combo battery packs used these internally. Many Miltary Radios used these as emergency alternates to Rechargeable packs (24V using NiCd "D" size ).

Originally card or paper covered with tar seal at top. Modern versions use a hollow plastic bung, with cheap brands using TWO bungs to save on content! May be the 2nd Dry Cell commercially available. The outer can is the Zinc Electrode.

"Dry Cells" are called "Unit Cells" up till mid 1930s.

Later Zinc Carbon types are "Leak Proof" construction (not actually leak proof). Later Exide Drydex Leakproof model is actually branded "SP2" rather than T20.
High Power versions are usually Zinc Chloride.

Alkaline Types can be used instead but weigh a lot more (Duracell, Energiser and equivalents) though in low current drain capacity is only x2. In 1930 Shelf life was about 6 months and by 1946 about 18 Months. Now about 24 months in temperate conditions compared with over five years for Alkaline.

Equvalents

• Ever Ready U2, later SP2, LP2, and Zinc Chloride HP2
• Generic "D" or IEC R20 (Alkaline is LR20)
• GEC: BA6103
• Siemens T1
• Vidor V0002

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Alle gelisteten Radios usw. von Chloride Electrical Storage Co. Ltd.; London