Instruct: Classify a given review into positive or negative sentiment.
Query: Battery "bubbled" after less than 6 months

After less than 6 months of using this battery, it has "bubbled". The chemicals inside have expanded and so the once-flat sides are now pushed out and rounded (kinda like those bad laptop batteries you keep hearing about). It hasn't ever been in extremely hot or cold temperatures (it never gets left in the car or outside). So because of this, the back won't even fit on my Dash correctly anymore. Also, the battery life is down to maybe 12 hours (making maybe 1 or 2 phone calls during that time), probably a side effect of the battery bubbling. I would not recommend buying this battery as a replacement.