Donald
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Originally Posted By: eljefino
Originally Posted By: DBMaster
I found pretty much all rechargeable standard battery sizes to be of limited usefulness due to the 1.2 Volt issue. A standard AA is 1.5 volts. While a rechargeable AA may have more capacity, the item you are powering needs to be able to run effectively on 1.2V per cell rather than 1.5. For a lot of applications (my nose hair trimmer, for example) I have to toss the battery once it drops below 1.3 or 1,4 volts. The motor just can't spin fast enough with the lower voltage.
I wonder what the "under load" voltage of the half-dead alkalines were. NiMH has less internal resistance so they keep their open cell voltage better under load... short to say, they drop less, which helps with their lower starting point.
Though its more than plausible that a lot of stuff is designed around getting rechargeables, your robot nose picker excluded.
It might be a good idea to modify your robot nose picker to allow you to monitor the battery voltage while the robot is in motion.
Originally Posted By: DBMaster
I found pretty much all rechargeable standard battery sizes to be of limited usefulness due to the 1.2 Volt issue. A standard AA is 1.5 volts. While a rechargeable AA may have more capacity, the item you are powering needs to be able to run effectively on 1.2V per cell rather than 1.5. For a lot of applications (my nose hair trimmer, for example) I have to toss the battery once it drops below 1.3 or 1,4 volts. The motor just can't spin fast enough with the lower voltage.
I wonder what the "under load" voltage of the half-dead alkalines were. NiMH has less internal resistance so they keep their open cell voltage better under load... short to say, they drop less, which helps with their lower starting point.
Though its more than plausible that a lot of stuff is designed around getting rechargeables, your robot nose picker excluded.
It might be a good idea to modify your robot nose picker to allow you to monitor the battery voltage while the robot is in motion.