Sobra na ngang mahal ng batteries ngayon. And when they die, they die suddenly,- with very little warning........ Hindi katulad ng mga batteries noon....

Kaya nga, some people who I know, change their batteries every 18 months just to be sure...

Ako,- I basically wait for telltale signs.... Kung medyo may kaunting palya or anything na out of the ordinary sa start sa umaga and more than 18 months na ang battery,- I change battery on that day....

AFAIK, mas mataas ang rating in terms of AH ng 3SM vs. 2SM. So, as you go higher/bigger, the capacity of the battery to deliver current/power over a period of time also goes higher.... For example, a 50AH battery can deliver an Ampere of current for 50hours; or 2 Amperes of current for 25hours and so on.... A battery, theoretically can deliver very high current...

5101:pcwhack: