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we had this same issue a few years ago - we settled on one brand
of replaceable batteries - we went with energizers which we switch out
right before every run during the tournament.

One reason is that the discharge curve drops off pretty severely after a
short while - also the rechargeable batteries have less and less staying
capacity as we go along.

We also run the robot a few times through its program set
before the competition round - takes the edge off the discharge curve.
Here's the AA discharge curve that backs up my thinking:



On Tue, Nov 25, 2014 at 5:44 AM, John Davison <[log in to unmask]>
wrote:

> As part of our rookie lessons learned for next season, does anyone have
> thoughts about the pros and cons of using rechargeable vs. regular
> batteries?  Early on, we found that our robot performance varied quite a
> bit based on how fresh the batteries were, and we seemed to be burning
> through lots of regular batteries.  So we switched to rechargeable
> batteries soon before the competition, but then had to tweak our
> programming because the output of rechargeable batteries is different from
> regular batteries!  If we stick with rechargeable batteries for our next
> robot design, are there any potential problems or downside that others have
> experienced?
>
> John Davison
>
> Sent from my iPhone
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