I'm probably the last person in the state with a cordless mower, but I like it because of the low noise and lack gas, fumes, lots of parts that can break etc. I've always been able to do our entire 1/4 acre lot on one charge, provided the grass is dry, but I admit it tends to bog down near the end, and more so recently. (It's kinda heavy too.) Bought it in '97 --a Toro Carefree 24(v).
I have just barely survival knowledge things electric so I'm seeking your advice.
If I could get a 20% longer run time I'd be happy. I took off the lid of the mower. There are 2 12V batteries wired in series driving a 24V motor. There's a empty slot for one more 12V battery. The label on the batteries read: "Yuasa sealed rechargable lead-acid battery ylm
18-12 12v 17.2Ah voltage regulation 14.4-15.0V initial current 4.3A max".I thought I would buy and install an extra 12V battery of similar amp/hours and form factor. (Found one at gotbatteries.com.) I'll wire the new one in parallel with the original two (keeping those wired in series).
I can't find much out about the internal charger (You plug this mower into a 120V socket to recharge.), but the charger is still going to see one 24V battery anyway, right?
Do you think my idea will work or am I missing something?
--wahzoo
PS. I called Toro (who no longer makes cordless mowers) and they "didn't recommend" my idea, but I believe they're just being legally careful. Also I'm gonna strap 15 lbs of barbell plates to the mower to test if I can tolerate the extra weight!