EcoRenovator - View Single Post - Reviving a free, dead 12V cordless Black & Decker mower

MetroMPG · 07-14-11, 01:57 PM

Capacity testing, part 3...

Did another one of the 7.2 Ah rated batteries, and this one's good!

- pulled 4 amps for 45 minutes (!) before the inverter shut things down @ 10.9 v (why not a 11.0v cut-off like the others, I'm not sure - maybe a function of how "stiff" the battery was - voltage dropped much more slowly & steadily than any of the other 3).

Compare to 4 amps for 7 minutes, which was what I got from the other 7.2 Ah batt. (The one I thought was probably best, based on its higher 13.1 resting voltage when I got them.)

So, as a proportion of rated capacity, this one's the healthiest of the four batteries tested so far.

Unfortunately, one good 7.2 Ah battery does me no good. Need 3 or 4 of these to put in the mower. (Or 3 to put in the electric car... or...)

07-14-11, 01:57 PM	#36
MetroMPG Infrequent noob Join Date: Aug 2008 Location: 1000 Islands region, Ontario, Canada Posts: 402 Thanks: 37 Thanked 20 Times in 19 Posts	Capacity testing, part 3... Did another one of the 7.2 Ah rated batteries, and this one's good! - pulled 4 amps for 45 minutes (!) before the inverter shut things down @ 10.9 v (why not a 11.0v cut-off like the others, I'm not sure - maybe a function of how "stiff" the battery was - voltage dropped much more slowly & steadily than any of the other 3). Compare to 4 amps for 7 minutes, which was what I got from the other 7.2 Ah batt. (The one I thought was probably best, based on its higher 13.1 resting voltage when I got them.) So, as a proportion of rated capacity, this one's the healthiest of the four batteries tested so far. Unfortunately, one good 7.2 Ah battery does me no good. Need 3 or 4 of these to put in the mower. (Or 3 to put in the electric car... or...) __________________ . 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. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.