The Media  eats batteries like candy, so I don't blame you for wanting to go with rechargables. I don't personally have any brand recommendations, just make sure you find D's with the highest MaH (MAh, Mah, mAh, however it's labelled) number you can find. In D's it's probably mAh, meaning milli-amp hours, effectively meaning how long they'll run between charges. You also want to make sure you find batteries that are truly 1.5 volts, as most rechargeables are 1.2 volts, that's almost two whole volts shy of what the Media wants to run it's motors.

You're lucky if it made it a few weeks. Mine walked for two days before noticeable battery drain on the D's (also Energizer). 

Watch out, don't step in the anthropomorphization.

I think you should go with the energizer e2 or Duracell PowerPix batteries not rechargeable's because rechargeables's are 1.2 volts and the RS Media needs 1.5 volts. When you are buying battries look for these ones-

http://www.target.com/Energizer-E2-Lithium-Batteries-2-pk/dp/B00003IEMD/sr=1-1/qid=1205194592/ref=sr_1_1/602-7361238-6780662?ie=UTF8&index=target&rh=k%3Aenergizer%20e2&page=1 

or

 http://www.target.com/Duracell-NiOOH-Powerpix-Batteries-4-pk/dp/B000EQ6HXO/sr=1-2/qid=1205194672/ref=sr_1_2/602-7361238-6780662?ie=UTF8&index=target&rh=k%3ADuracell%20PowerPix&page=1

The 1.2 volt rating of rechargeables vs. the 1.5 of regular duracells is not that big a difference.  Non-rechargeable batteries real power output tends to run down over time while rechargeables give the full 1.2 v till no charge is left.

 I found out that 2200mh rated 4 x D rechargables didn't last long on the Boa - but that changed when i switched to 7000mh ratings my robot sessions stretched from a few hours to a couple of days.  I recommend you try something more higher rated - at least 4000mh.

GP batteries & their charge unit have served me well.

If it's of any help I use 12,000ma D nmh batteres and re charged with an Ansman 16 battery charger,these batteries last for weeks, No problem with the different voltage &.2v compared to 9v.http://www.thomas-distributing.com/ansmann_battery_charger_5407013.htm

This charger charges 6 D cells or 12 AA cells and 4 PP9 9v batteries.

Batteries that I have installed in my RSV2

http://thomasdistributing.com/shop/cta-digital-nimh-12000mah-d-cell-rechargeable-batterybr2-battery-pack-p-510.html?SP_id=&osCsid=jucmh5kevapfsuflcr1q2dg2c7 

People yearn after this robotic dream, but you can't strip your life of all meaning, emotion and feeling and expect to function.


Robotic madness http://robosapienv2-4mem8.page.tl/