The Battery
The metering circuit was designed for the obsolete 1.35-volt 625 mercury battery, but it may be directly replaced by the easily obtainable zinc-air hearing aid 1.4-volt 675 battery of equal size and style, which is not very expensive in use, even if not lasting very long. This is certainly the best solution from every point view featuring: stable correct voltage, high capacity, it lasts several months, and there is no risk of acid leakage.
- Zinc Air 675 Hearing aid battery is available single or in a six-pack.
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