Batteries with excellent stamina

[Scientific Ben]

The title of this thread may be misleading, but I do not now the word to describe a certain type of battery. I know there are certain batteries which hold there peak wattage/voltage fresh of the charge until they die; But I'm curious about this subject.
-Are there certain type of batteries which flat out put out continuous amperage of which they are rated (aka Lion 3.7v)? -Are these P.V.'s circuits specifically wired to regulate a maximum power output all the time?

If it turns out I actually know what I'm talking about could I get some specific examples? [Educate me ]

 

[johnnymaestro]

I'm going to put your thread in the battery mods discussion because I think they might have some of the more specific information you're looking for. Thank you!

 

[sailorman]

No battery I know of, not even the little NiMh AAs, puts out a constant voltage under a load throughout their charge cycle without the help of a regulation circuit of some type.

Any PV that puts out a constant voltage at the connector or under load uses a regulation circuit to do it.
A lot of flashlights do the same thing, voltage or current regulation. It can be much more critical in a flashlight application. The disadvantage is that once the voltage drops, boom. You're in darkness with no warning.

No battery holds it's freshly charged voltage until it dies. They all have a voltage drop. Only separate circuitry can even it out in whatever device you're using. A circuit could force a battery to hold higher than 3.7V, but you'd lose battery life between recharges. In a VV Pv, that's the tradeoff you make, to one degree or another.

How much current is drawn throughout a battery's charge cycle is a function of the device, not the battery. I'm no expert, so the way I understand it is that there are current regulation circuits that will maintain a certain amperage draw, regardless of variations in the voltage supplied by the battery. Again, these are most common in flashlights. But when the battery is unable to keep up with the current draw, IOW, the voltage is so low that the demanded current is too high for the battery to provide safely, the circuit cuts it off or "downshifts". These flashlights will burn bright for a while, then go into a "power saving mode" for a while until they cut off.