I found this at Sandhill Raceway Cell website:
The NEW “shorty” GP 3300 - The “long” GP 3300 that we are accustomed to running with awesome voltage and low internals has been >> discontinued<<. It has been replaced by the new “shorty” GP 3300. The shorty is approximately 1 mm shorter on the positive tab; it appears it has been smashed down into the cell. However, the weight difference is not even noticeable.
Performance: This cell is very strange. Although the labels read are very low they perform outstanding on the race track. Racers have become too accustomed to labels / numbers / and their chargers. With these cells, these methods of comparison from the old cell to the new cannot be used. I can honestly say that a 1.165 – 1.170 in the new cells is equal to almost a 1.180 in the old cell. Track records are being beaten across the country with mid 1.16’s to upper 1.16’s. The old cells performed very well on the second run because of increased voltage but loss in runtime. The shorty will not lose runtime but gain on the second charge, about 150 – 250 seconds more!!! Now modified racers can even run them twice, who would ever believe that! The packs have much more punch and rip on the second run! Even three runs in 48 hours are possible without loss to performance.
Assembly: If you are gluing the cells use Shoo-Goo for easy disassembly. Any type of battery bar, whether silver or gold, is recommended. Most important is not to overheat the cell while soldering. This common problem can be avoided by using a hot soldering iron (40 watts+) with quality ROSIN core solder not acid core. If possible do not pre-tin the cell with solder as this could reduce performance because solder is a poor conductor of electricity. A good tool for assembly is a Dean’s® battery jig. Avoid using shrink wrap around the entire pack as this can trap heat and rob power.
Matching: Use the same charge rates as listed above for charging. Set the discharge rate to 30 amps with a .90 cut off and time of 5000. These are the same parameters we use for matching. Make sure no air is circulating around the cells as this can give inaccurate readings. Do not use a fan. If you are using a Turbo 30 or 35 chargers make sure the voltage alligator clips (small), are connected directly to the bar and not to the current alligator clips (large).
Charging: Only charge GP 3300’s with chargers suitable for NiMH batteries. Suggested charge rate is 6.0 amps with a peak detect setting of 0.03 volts for 4 cells and at least 0.05 volts for 6 cells. Before a race, repeak the battery again between 4 and 5 amps with the same peak detects. Repeaking helps lower the internal resistance of the battery, although it doesn’t significantly improve voltage.
Discharging: When the race is completed discharge your battery down to 0.90 volts per cell or 3.60 volts for 4 cells and 5.40 volts for 6 cells. If you would like to increase the performance of your pack try using an “equalization” tray for a few minutes before charging to equalize the cells. Note that some trays on the market are not equalization trays and do not have a cutoff point. The “equalization” tray can also be used just after the battery has been discharged. If you do not have charger capable of discharging try using at least ten 1157 tail light bulbs wired in series. The bulbs are 2 amps each which will give you at least a 20 amp discharge.
Any comments or input regarding these new cells will be appreciated. PLEASE POST ALL RESPONSES HERE IN THIS THREAD.