AVR-Chat

David VanHorn wrote:
>> That's another point.
>> If backup usage current is below 500mA, then use plain and cheap
>> Alkaline ones.
>> They are safe, shelf life is much longer than anything else.
>> Of course, lithium current limit is a good idea, perhaps a small
>> fuse? :)
>
>
> Fuses that small are WAY expensive, and I don't think you can go that
> low.


You mean 250mA and 500mA small fuses?  That's pretty common, radial or axial
socketed ones.  For sure the fuse will open much sooner than the battery
detonates into a Radiologic Thermal Event... :)


> I once talked to a Panasonic apps guy about a design we had, that put
> 600nA into a lithium cell. His comment was that it probably wouldn't
> explode.


Are you talking about recharging current?


> If the steering diode on the battery output fails, then you need to
> still have essentially zero current into the battery, by some means.


That's the Alkaline advantage, but a 20 megaohm resistor in parallel will be
something to think and avoid the battery leaking or contacts corroding.


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