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Need help finding replacement lead-acid battery for Robomower


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#1
garsh

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Posted Image
The battery in my robomower died over the winter, so I need to find a replacement. So, I could get a robomower battery from ebay, but they want $175+!!! Froogle prices are about the same. Hard to spend that kind of money when the mower only cost me $185!

So I took the battery pack apart, and found that it contains two standard lead-acid batteries. Here's the information I found on these batteries:

YUASA
Valve Regulated Lead Acid Battery
Cyclic Application
NPC17-12 12V 17Ah
Charging (20): 14.4V - 14.8V, Max 4.25A
size: 181 x 76 x 167 mm (7.13" x 2.99" x 6.57")

So then I try looking for someone who sells this battery. Turns out it's only sold in Europe. I can't find anyone selling it in the states. So now, I'm trying to a domestic equivalent for this battery. And then find a good price on it. Can somebody knowledgeable about lead-acids help me find equivalent batteries?

Posted Image

Added info: just wanted to point this out for people in the future who might stumble across this thread while looking for their own replacement batteries - the terminal type isn't important. These batteries have the bolt-hole, but there are "adapters" in the battery case that convert this to the tab style. So either kind will work just fine with no modifications necessary.

Edited by garsh, 19 July 2006 - 11:53 AM.

"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup



#2
garsh

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This looks promising: Powerstream: B&B Battery

The following three models appear to be the correct size and voltage, and differ only in the terminals:
EVP20-12-B1 (in stock), $45.66 ea
EVP20-12-T2 (special order)
EVP20-12-I1 (special order)
Here's the terminal diagram for that first one:
Posted Image
That looks like it should work. Can anyone see a reason why it would not?

Total with shipping would be $112.45
Still seems like a lot to spend on batteries.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#3
garsh

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Found another: Solar4Power: Deep Cycle Batteries

The ES1712 VRLA-AGM Battery appears to be the correct size, voltage, capacity & terminal.
Total for 2 batteries + S&H = $96.20
Getting better.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#4
garsh

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According to this page, the B&B EVP20-12-B1 is equivalent to an Interstate SLA1118
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#5
cron

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how bout this?

or this?

#6
garsh

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how bout this?
or this?

I think I need a battery designed for cyclic applications, which is why they cost more.

A UPS is almost always fully charged. The robomower is almost always running its battery pretty far down every time. Most lead-acids will not last long if they are constantly run down that far.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#7
cron

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Let me try again...

how bout this one?

__________________________________________________________________

It may also be worth calling batteries.com to double check and see if they have anything comparable.
batteries.com has this promo running right now:
25% off orders $9.99+, Free 8 Pack of AA Alkaline Batteries, and Free Shipping Code: RAIN

#8
garsh

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Let me try again...

how bout this one?

Wow, that looks like a match. And only $27????
I'll investigate more, to see what I'm missing, but everything looks good so far.

Ok, they make up some of it on shipping. $80.94 shipped for two batteries. Still the best price so far. :)
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#9
garsh

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Also found this: Jameco Electronics: Tysonic TY-12-18, $32.85 ea.
$93.52 shipped for two.

I need to find a local store so I can save on shipping.
I guess a place that sells golf carts or motorized wheelchairs.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#10
garsh

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Another one: Powerizer LA-12V18-NB, $35.99 ea.
$95.11 shipped for two.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#11
kas

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Look up in the Yellow Pages local medical supply businesses. Some probably do in-house service on the motorize wheel chairs they rent to customers and might have the batteries. Otherwise, someone there might tell you where to get them.
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#12
HarleyD

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http://www.batteries...sp?appid=265095

Our Price: $27.99

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#13
cron

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http://www.batteries...sp?appid=265095

Our Price: $27.99


that's definitely the best deal because of the current batteries.com coupon, but apparently garsh mentioned that it's not a deep cycle battery.

you could get two for $42 shipped plus some free AA's.

#14
garsh

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that's definitely the best deal because of the current batteries.com coupon, but apparently garsh mentioned that it's not a deep cycle battery.

I might just get 2 of these and just plan on replacing them sooner. That's a pretty good price. Any idea how long the current promotion lasts?
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#15
garsh

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Batteries.com coupon exclusions

Due to weight restrictions, orders containing Optima vehicle batteries, Sealed Lead Acid products, Energizer UPS units, or alkaline orders over 2 pounds do not qualify for our Standard Shipping Rate or Free Shipping Offers.


Still, it comes to $53.23 shipped for 2 batteries & the free AA's.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#16
garsh

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Still, it comes to $53.23 shipped for 2 batteries & the free AA's.

Ok, I ended up going with this. We'll see how it works. Local prices were pretty high.

Thanks for your help guys! :)
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#17
garsh

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Well, after running with these for several weeks, I found that they do not last as long as the original batteries. They don't even last for a full 2 hours of cutting. I'll probably live with them for the rest of this summer, but I'm going to have to find something better. Still, can't beat the price!
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#18
garsh

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These batteries are dying a quick death. They don't seem to last much more than an hour now. At this rate, I'll have to start cutting my own lawn. :(

Let me try again...
how bout this one?

I decided to order two of these. They should arrive on Monday.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#19
mtran1977

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How are the Tysonic batteries working for you? I bought some batteries off Ebay and they aren't doing so well after 1 year. Thanks.

#20
garsh

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How are the Tysonic batteries working for you?

Well, they're doing much better than the batteries.com ones. But just this week it's been hitting the "low battery" indication just before finishing the entire 2-hour run. I've been running the mower almost every single day this summer (except for rainy days).

If I were to do it again, I would try the B&B batteries. They seem to behave better under high discharge (300 cycles for 100% discharge, versus 200 cycles for the Tysonic).
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#21
dejavu

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so this is for a robotic lawn mower? how cool. does it really work? what do you have? several acres? how does the thing not get "stuck" all the time? (you know, like a RC car would) -blink-
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#22
garsh

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so this is for a robotic lawn mower? how cool. does it really work?

Yep.

what do you have? several acres?

Nope. I have about half an acre. It'll take that thing about 5 days, running 2 hours each day, to adequately cut the whole thing. That's a lot longer than it takes me, but then I don't have to push it & sneeze my head off the whole time. :)

how does the thing not get "stuck" all the time?
(you know, like a RC car would)

This thing is a LOT larger than a Roomba, if that's what you're thinking of. It's a bit larger than a normal-size push-mower deck. But it doesn't work very well on hills, and if you have any ruts in your yard, it can get stuck in them.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#23
mtran1977

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Well, they're doing much better than the batteries.com ones. But just this week it's been hitting the "low battery" indication just before finishing the entire 2-hour run. I've been running the mower almost every single day this summer (except for rainy days).

If I were to do it again, I would try the B&B batteries. They seem to behave better under high discharge (300 cycles for 100% discharge, versus 200 cycles for the Tysonic).


Thanks for the info.

20AH B&B batteries (EVP20-12) are much cheaper from Digikey.com - $85 shipped for 2. Check out this yahoo group post.

http://groups.yahoo....r/message/10921

http://www.bb-batter...VP/Evp20-12.pdf

#24
garsh

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The Tysonic batteries aren't lasting much longer than an hour now. So I'm going to try something else.

I found MK Battery model ES17-12. And I found several places selling it:The Depth of Discharge curve seems slightly better than the Tysonic batteries at 100% discharge, but otherwise it doesn't seem much better.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#25
garsh

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20AH B&B batteries (EVP20-12) are much cheaper from Digikey.com - $85 shipped for 2.

Thanks, mtran1977. I think I'm going to try these. I found this article about converting a Prius to be pluggable, and it confirms that these BB batteries have some of the best characteristics of lead-acid batteries.

In addition to Digikey, Battery Universe also seems to be selling these for $39.95 ea., plus $15.59 S&H, for a total of $95.49. Digikey is quoting a 14-week lead-time on this item right now, so I'm going to try ordering from BU.

edit: I ordered them and they have them in stock, so they're shipping out today! :)
I hope these batteries will last for more than one year.

Edited by garsh, 16 April 2007 - 10:50 AM.

"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#26
garsh

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Found another inexpensive vendor for the BB EVP20-12:

Powell Electronics, $39.13 ea., $8.95 S&H, total: $91.91

They have a 9 week lead time advertised, though.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#27
garsh

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edit: I ordered them and they have them in stock, so they're shipping out today! :)

Well I received them today. Instead of the BB EVP20-12 batteries, they sent Universal Battery UB12180 batteries.

They are the same size & voltage, but are not deep cycle batteries and will not work in this application. :rolleyesold:

Between this and the Penguins being down 3-0 going into the 3rd period, I'm quite angry. I managed to fire off a decently-worded email asking them to send the correct batteries & provide instructions for returning these incorrect batteries.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#28
garsh

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Found another inexpensive vendor for the BB EVP20-12:

Powell Electronics, $39.13 ea., $8.95 S&H, total: $91.91

They have a 9 week lead time advertised, though.

I just placed an order with this company. The 9 week lead time is gonna suck, but I don't appear to have much of a choice if I want this battery. :(
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#29
garsh

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Ok, I'm going to try to find the best price on the Yuasa battery. The specs on this battery appear to be even better than for the BB battery (600 cycles at 75% DOD, ~370 cycles at 100% DOD).And that's all I could find who would ship to the US. :(

update: I found out that the Yuasa now seems to be called Enersys. That's part of the problem with trying to find this battery. I guess it's not being manufactured anymore, because I can't find the NPC17-12 on Enersys's website.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup

#30
garsh

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Another possible replacement: the Panasonic LC-X1220P
Specifications
Doesn't provide DOD characteristics though.
"I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone." - Bjarne Stroustrup




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