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Daox · 09-16-09, 06:03 PM

Unfortunately, you do check your battery voltage for SOC under load. The point being, you never want the voltage to sag under 10.5V or you risk damaging them. The voltage sag really does tend to screw things up when you're putting a big load on the batteries though.

Voltage really isn't the best way of measuring SOC though. The only way to really know is to use a specific gravity tester (which only works on flooded batteries), but thats just not practical while you're using the mower.

I did look up your batteries and they don't have an Ah rating on them. I would double check and make sure that they aren't a hybrid battery (aka marine starter). They are a mix between a starting battery and a true deep cycle battery. Marine starting batteries aren't built for constant deep cycling like full blown deep cycle battery is and definitly won't last as long.

09-16-09, 06:03 PM	#104
Daox Administrator Join Date: Aug 2008 Location: Germantown, WI Posts: 5,525 Thanks: 1,162 Thanked 374 Times in 305 Posts	Unfortunately, you do check your battery voltage for SOC under load. The point being, you never want the voltage to sag under 10.5V or you risk damaging them. The voltage sag really does tend to screw things up when you're putting a big load on the batteries though. Voltage really isn't the best way of measuring SOC though. The only way to really know is to use a specific gravity tester (which only works on flooded batteries), but thats just not practical while you're using the mower. I did look up your batteries and they don't have an Ah rating on them. I would double check and make sure that they aren't a hybrid battery (aka marine starter). They are a mix between a starting battery and a true deep cycle battery. Marine starting batteries aren't built for constant deep cycling like full blown deep cycle battery is and definitly won't last as long. __________________ Current project - To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. & To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.