Calcium sulfate. It's what happens to the lead when it sits inactive with the acid in it. I know they make something to put in the battery to help break it up, but you need to also charge it up fully and do a maintance desulfate charge on it to zap it loose.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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