Yep, BATTERIES begin to die... from the moment they are made.
.. even while they are "new" sitting on a shelf somewhere... it's called "shelf life". Maybe the exception is a 'wet' battery where the ACID is added at the last moment before use?
rechargeable batteries can be seriously DAMAGED
with a TOTAL discharge... In most cases batteries HATE that event
and will punish you with "memories"!
Even ONE incident MAY
your recharge abilities and this is especially
true with cheaper batteries with poor chemistry inside. Understand this is NOT
to say more expensive batteries are bullet proof.
A few rechargeable batteries LIKE to be thoroughly "exercised" and a "deep cycle"
car or RV battery is the best example of that, but even a deep cycle has it's discharge limits!
SO... when you get your first "LOW BATTERY"
alert take it VERY seriously
... end your session as soon as possible and bring your Frankenstein back to life again and again.
See this link for GREAT battery insight and assure a long life.
Trust me, this topic is not fiction or fable.