Staff reported: bedside registered nurse went into room after report of telemetry box not working.Upon picking up box, it was very hot and began smoking.She opened the battery case to find that the alkaline batteries were fully melted and shorting out.Device brought to clinical engineering for evaluation.This transmitter uses two aa size alkaline disposable batteries.One battery had overheated and ejected material around the negative terminal.The other battery was undamaged and measured 1.6v (full).It appears part of the insulation around the negative terminal of the battery was damaged at some point and allowed a short circuit against the battery contact in the device.It is not known how the battery insulation was damaged, but it is very thin.The shorted battery became hot enough to melt and split the plastic sleeve that covers the battery.A considerable amount of material was ejected from the shorted battery and assumed to be caustic.The transmitter was still functional and sustained only cosmetic damage.There was no patient or staff injury reported.
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