for people dealing with Lead Acid Batteries, like inverters, backup supply, etc. you may want to check Peukert's Equation for an accurate computation of the actual Ah rating at different loads. 20 hour rating lang kasi ang binibigay sa atin ng mga manufacturer, bihira yung nagbibigay ng discharge graphs (CSB nagbibigay sila).
http://www.smartgauge.co.uk/peukert2.htmlhttp://www.smartgauge.co.uk/peukert_depth.htmlkung gagawa ng coulometric gauge for Lead Acid's kailangan i-consider yang equation, para corrected ang Ah rating at different loads.
eto yung based sa experience ko sa General Purpose SLA.
at 1C or equivalent sa nameplate rating - 30 minutes lang tatagal ang battery
at 0.6C - 1 hour tatagal ang battery
at 0.25C - 3 hours tatagal ang battery.
at 0.1C - 9 hours and 30 minutes tatagal ang battery.