APC UPS unit has a swelled battery
Heat can also cook the batteries, they must have good air flow around them and never put anything on to top of them.
3770k [KL370]|| 3xMCR320[basement] || EK BAY RES|| 655x2 ek-tops || Vl4n
MVF WC || Evga GTX 780sc sli EK block,s
Sam 256gb 840 Pro R0 -EVO 750GB= backup|| HAF 932 || 8 gb Tridents 2400
W7HP-64 || 27"A850D || SEASONIC 1050W || G15,G13,G502
SB-Z -analog >Yamaha 765 AVR, 4x PSB alpha b1 ,1 x PSB alpha C1 ,10" sub