Aahnold

Thanks! :D

Does anyone know if it's possible to detach Steering Portal Axle's hub from the housing? http://i.imgur.com/4wr6n.jpg I have problems with it. The hub continues to jam a bit and lately it started to squeak.

I have to correct myself. There are 8 types of rechargeable lithium batteries, including lithium-ion and lithium polymer. It's just only those two types that are widely available to consumers. Anyway, this thread went slightly offtopic. I am new here, so I don't want any trouble. It's unfortunate that eurobricks forums don't have offtopic tags.

That means only one thing: 1 battery can provide electric current of 1A for 3 hours or 3A for 1 hour. Your link says lithium-iron disulfide. Li-FeS2. That battery is not rechargeable. http://en.wikipedia.org/wiki/Lithium_battery#Chemistries There's no such thing as rechargeable lithium battery. Unless it's lithium-ion or lithium-polymer. http://www.energizer.com/batteries/ultimate-lithium/Pages/aa.aspx

Lithiums are indeed the best amongst other types of non-rechargeable batteries. I think I'll stop at rechargeable Ni-Mh batteries. http://en.wikipedia.org/wiki/Nickel%E2%80%93metal_hydride_battery#Comparison_with_other_battery_types

Don't chase for those numbers. Do a research first. What I've learned so far: rarely do rechargeables live up to these numbers. And even if they do, high number of mAh doesn't mean high Watts per hour or energy they can accumulate. There are many characteristics for batteries apart from mAh. Like internal electrical resistance, self-discharge rate, ability to hold high voltage over certain periods of usage... Sanyo Eneloop are the best choice it seems. Top Japanese quality. Unfortunately we don't have those in Russia. What boggers me is why there no 1,5V rechargeables. As for LEGO battery box, don't know. Maybe it has something to do with low weight. But it's not like it's space or nano tech. And the DC transformer for $25? Nah, the reason is simple. To milk customers.

I have returned to building Lego just recently, about a month ago. My first set was 8109. It's the first LEGO I had in 10 years. I am 22 now. 9398 is my second. I was unfortunate enough to buy general puprose batteries for it. On the second day of not so intensive usage, the speed and crawling ability of 9398 decreased greatly. Compared to relatively fresh 8109 battery box, the motors ran slow and were easy to stall. Last night I tested the battery and what was left of it's charge to see how it's torque and speed will decrease over time. It lasted for about 1,5 hours before being completely unable to turn two PF L motors. So yeah, voltage affects not just rotation speed, but torque too. Thus, one should keep in mind what energy elements to choose. 9V standart batteries or 7,2V rechargeables? What's your opinion?