Share ko lang. Pag out of warranty na ang maintenance-free car battery nyo especially kung 2 yrs old pataas at mahina na, you can add battery solution - not distilled water, to prolong the life of your battery. Ginawa ko na ito at effective naman. Sunod ko advice ng taga battery shop na nakausap ko. Tanggalin ang battery sticker at unscrew the caps. Do not over fill.