Old Medical, and Hearing Aid Batteries

Earlier Medical LT batteries

Probably some for "carbon" based hearing aids in 1900s to 1920s. Some for gadgets like electrified hair brush.

Type Voltage Cells mAH W mm  H mm D mm Weight Conn.  
D1 3 2x – 57 89 70 227 2 x pin
D2 3 2x – 57 64 22 170 2 x flat
D3 3 2x – 44 57 24 106 2 x flat
D4 3 2x – 51 95 25 199 2 sockets
D5 3 2x – 57 83 22 199 2 sockets
D6 3 2x – 95 89 73 199 2 x pin
M2 4.5 3x – 78 83 25 199
R0? 4.5 3x – 78 79 25 199 2 sockets
  1. M2  for Throat lamp
  2. R0 ? nearly unreadable
  3. Dimensions almost unreadable fractions
  4. Weight in grams

Hearing Aid LT batteries (from 1938 or 1939)

For 1.4V valve (tube) filaments. Also used for other applications.

Type Voltage Cells mAH W mm H mm D mm Weight Conn.  
D9 1.5 F A
D10 1.5 B (U10) Rc
D12 1.5 2 x U12
D14 1.5 U12 Rc
D18 1.5 AC2 A
D19 1.5 D19 A
D20 1.5 AC2 Rc
D22 3 2 x NS? 44.5 11.1 Rc
D23 1.5 N?     30.1 12.0 Rc  
D29 1.5 AC2
  1. D19 = Zenith Transoceanic Z1 Scale lamp battery
  2. No listings found D7, D8, D11, D13, D15, D16, D17, D21 & D24 … D28

Battery Connections

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