Nokia has issued a warning regarding their battery, the BP-6M, which is fitted to several Nokia handsets, including the Nokia N73, 6280, N77, and 3250 XpressMusic handsets, to ballooning in size, and in some rare cases, expanding several times their original size, resulting in non fittment into the devices they are intended.
Nokia do confirm however, that there is nothing to be concerned about, and that if you find your BP-6M to have ballooned, and no longer fits into your N73 etc, you can take the battery, providing its a Genuine Nokia battery to your nearest Nokia Care Point, where it will be replaced FREE of charge.
See here, where you can find out if your BP-6M is a Genuine Nokia Battery.
Nokia isn't saying how common this problem is, only that it affects a "limited number of batteries" and that the ballooning presents "no risk to health of safety".
Lithium-ion batteries often gently swell up after a few years, and even unused batteries tend to enlarge after around three years, so those unused handsets you stuck in a drawer could be popping open as you read this. Not that there's any risk from this - it just makes the batteries hard to fit into the charger, or mobile phone, and shouldn't happen for a few years at least.
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