Ok everyone, I just came across an interesting find. To my knowledge all of the 5 and 6 cell modifications have been done so far by simply adding on an additional AAA battery holder to the circuitry. If using NiMH batteries this would put the total supply voltage up to 6.0V (for 5 cell) and 7.2V (for 6 cell) with a charge capacity of ~750-800 mah. While browsing the web I found another possible way to get the same voltage, but with less storage capacity. Take a look at
www.batterieswholesale.com and find the 2/3 AAA NiMH cells. They are the same diameter as a AAA yet only 2/3 the length. This means you could mod the stock battery holders to fit 2 of these 2/3AAA cell into each slot that holds one standard AAA cell. This would give you twice the voltage, but it would also reduce the capacity down to ~300 mah (for 2/3AAA). Hey, at a higher voltage and a reduced weight who knows if anyone would have the endurance to drive a rocket around for 25 minutes anyway. This will reduce run time, but will be worth it for the gains in voltage without the need to add extra weight. Hey Neuro, this would work great for your dragster project. You could even use the 1/4AAA cells for a single run.
Two problems exist with this method. The first is the fact these cells are not button top like standard AAA. This means they will have to be soldered together (a tricky thing that could damage the batteries) like 1/10 scale RC cars. The other problem is the way in which they will have to be charged. They can not be removed and simply placed into a Rayovac charger. A hobby grade peak charger designed for use with NiMH cell will be the only way to recharge these things. At any rate, I still think it is worth a shot to try this. I have already ordered my set of 1/2AAA and 2/3AAA. I will let you know how it turns out.
Threaded Mode
