Ultra long-life battery (accu) wanted

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Janis59

Joined Aug 21, 2017
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I would appreciate any advice about where to get or how its trade-name.
The project will use this battery in the body of animal, in hermetical ampule, where it must be capable to work some minimum minimorum 10 or 15 years, or better 30 years. So, to cache the animal and `surgeonize` the battery out every few years will be completely impossible. Correct recharging may be possible by external non-contact methods, thus the self-discharge is not the problem. But the problem is that no single one of all my known batteries are capable to stand against the degradation even for 5 years of exploitation, and that is sure too short.
Do You have any idea about any candidate?
 
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