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Hello Recently I bought a Mindstorms NXT programmable brick plus a rechargeable battery 9798 from someone on eBay. What the seller didn't mention is that the battery is slightly swollen. You can just about make it out in this terrible picture (sorry) : 20140918_193625 by freshfroot1, on Flickr So basically is has a slightly rounded top and bottom. I know that swelling up is normal for some batteries of this type and age (there are many cases of Apple MacBooks that have basically burst apart because of the same problem). It's not too bad yet and the battery still holds a charge. But I'd be interested to know if anyone else has experienced something similar, and if so, if it is possible to predict how long the battery will last. I know this could probably be a random number but I would be interested in others' experience anyway. Also what happens if it gets worse- does the battery split apart, just simply fail, explode dramatically? I'm not really bothered about it because the price I paid was about average for the NXT brick by itself. Also I'd expect it to be very unlikely that Lego would replace it, since it is probably several years old, is discontinued (replaced by 9693) and is probably counted as a consumable item anyway. Thanks --- EvilTwin