One of the main failure modes of Li-Ion batteries is trying to charge a defective battery ( puffed pack). When Li-Ion batteries begin to fail one or more cells develop a high internal resistance and heat up during charging. The 2hr warning is likely driven by the danger of trying to charge a bad pack more than the a time limit for a good pack. For packs with built in management/balancing circuitry ( no access to individual cells) it is difficult to see a bad cell. If you are concerned, there are fireproof pouches to put the battery in during charging. You can get them from most major RC model sites.
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