| 摘要 |
The energy source (8) comprises zinc-silver oxide batteries (14) in series between two terminals (16, 18). Another source (10) comprises lithium or lithium-based, batteries (20) also connected in series between another two terminals (22, 24). A pair of series-opposed diodes (26, 28) provide selective connection of a respective energy source to the load terminals (4, 6). When the load demands a current greater than that which can be supplied by the lithium batteries, the voltage output (V2) of these batteries drops. The diodes are then biased so that at least part of the load current is drawn from the zinc-silver oxide batteries of the first energy source.
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