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What is the amp hours of this battery?

dcbinkowski

Senior Heliman

Lombard, IL - USA

I bought a lawn tractor/utility battery at Lowe's today for about $20. For the life of me I cannot figure out its rated Amp hours. Does anyone know about this particular battery ?
Its crank Amps=275, its CCA=230.

SURE POWER - E.P.M. Products, Baltimore MD
Lead Acid maintenance free battery
Premium Heavy Duty
Part No. U1L-HP
CA @ 32F = 275
CCA @ 0F = 230

This number was also written on it in a couple of places.
3-6326

05-14-2006 Over year old.
ShellDude

Elite Veteran

East Coventry, PA

hmm.

put it through a charge/discharge/charge cycle and measure the amps and time for the final charge cycle.

You could probably also compare it to other lawn tractor batteries that have similar cranking amps specs.

think it'll fit in the 600?

05-14-2006 Over year old.
dcbinkowski

Senior Heliman

Lombard, IL - USA

I thought of that early on, I checked out a few different places, hoping to interpolate the data and figure it out. The numbers seem to be a little different for various brands of course. I'd say optimistically its a 19 Ah, abd probably no less than a 16 Ah. I sure wish that battery makers would express the numbers in a way that was useful, and not just in the way that they assume the battery will most commonly be used.

275 CA -> 19 AH
http://www.midstatebattery.com/marine.htm

260 CCA -> 19 AH
http://froogle.google.com/froogle_c...oring=mrd&hl=en

275 CCA -> 19 Ah
http://www.bigcrank.com/motorcycleb...mv?p=BIG-ETX16L


So, is it correct to discharge it with the following parms. 1.75v per cell, a C/20 rate (since the SOB's don't list it, I'll base it on my conservative estimate of 16 Ah, so an 800mA (0.8A) discharge rate. When the discharge is complete, the number of Amps that have been discharged are the rated capacity in Ah ? (Assuming I start from fully charged - its reading 12.65 right now)

05-15-2006 Over year old.
dcbinkowski

Senior Heliman

Lombard, IL - USA

FANTSTYCZNY !

This may sound like a complaint but its not, I actually got my Ah rating by getting EPM on the phone. It took 2 calls, I just called the number I found on a web page for EPM products. They couldn't help me at that number, but the girl answering the phone seemed to know how to answer technical questions, but not on Amp Hours since they don't provide those numbers. I was then given a phone number for their plant in the 610 area code.

I asked for an amp hour rating on their battery and she said they just don't list the Ah since its a starter battery they only list the Crank Amps and CCA. Only on deep cycle batteries do they list the amp hours. Here is the dialogue following that.

Me: "Is there any way I can determine the Amp Hours ?" (I have some ideas on how to do this discharging it on my Triton but I don't think I should have to).

Girl: "Hold on" (minute passes).
"18.6"

Me: "How did you know which battery I was asking about?"

Girl: "I'm sorry?"

Me: "I haven't told you its a 275 crank amps and part number U1L-HP. Do you just make the one battery then?"

Girl: "Yes."

Me: "Cool. Thats exactly what I was looking for. Thanks much!"

The answer... 18.6 Ah. If you have a U1L-HP - Sure Power - 275 CA / 230 CCA battery from Lowe's, its nearly 19 Amp Hours, and costs $19.95. Thats about 1 amp hour per dollar ! A great deal in my book.

05-15-2006 Over year old.
Revenant

Heliman

Fort Myers, FL

Ya know, I would be real interested in knowing too. There is no power at my field, so I gotta charge my lipos from a battery if I decide to stick with electrics. Thing is, 4x 2200mah bats will be about 9 amp hours or 9 amps for 1 hour to charge, right? That means that if I want to charge my bats more than once or twice, I will need a fairly beefy battery...which one and where to get it are my primary concerns. Anyone got some numbers on car batteries, tractor batteries, gell cells etc?

05-15-2006 Over year old.
ShellDude

Elite Veteran

East Coventry, PA

Yup, you're going about the most pragmatic of ways absent any real data from the maker. Unfortunately it doesn't help you as far as what its drop dead peak is, but if you extrapolate max amps out of the CA figure, then that should be good enough.

One word of caution, make sure that you're charging with a Lead Acid charger. The mechanics are a bit different depending on the cell technology, but you prolly already know that.

In regards to charging at the field... Make yourself up some nice long leads that you can connect to your car battery or your cigarette lighter. Nothing beats an alternator

05-15-2006 Over year old.
Revenant

Heliman

Fort Myers, FL

well, with gas as high as it is, and the fear of running my car battery dead, I would prefer to just have a dedicated battery for charging flight packs...

05-16-2006 Over year old.
nivlek

rrProfessor

Norfolk England

A mate has just given me a pair of 6V 115AH deep dischrge batteries .
They should be good for a weeks work between recharging .

At the end of the day , it gets dark .

05-16-2006 Over year old.
Revenant

Heliman

Fort Myers, FL

nivlek, mind if I ask what kind of batteries those are?

05-16-2006 Over year old.
nivlek

rrProfessor

Norfolk England

All I know for sure is that they are made by Hawker . I beleive that they where intended to run some sort of remote telecoms system , they say that they are intended for deep discharge , so should work well a supply for charging from .
I'll have a look on the batterys and see what else it says in the morning .

At the end of the day , it gets dark .

05-16-2006 Over year old.
cyclicpitcher

Senior Heliman

Memphis TN

Very happy with my Charger setup

Check out my gallery to see my field charger setup. I am using a 80 amp hour deep cycle marine battery I bought at Autozone. I also use a trickle charger I bought at Lowes. My two chargers are an MKII for Radios and a Poly 4 for my TREX and Blade. I have an ammo can tye wrapped into a Wheeled two compartment tool box I bought for 30 bucks at Walmart.

This setup works great and will be plenty to handle the TREX 600 in my near future!

www.funscale.com

05-16-2006 Over year old.
HOMEPAGE  
nivlek

rrProfessor

Norfolk England

Revenant ,
Here you go :
http://www.ardentsystems.com/acatal..._SBS_Range.html

I have the Hawker SBS 110 (two of) at the bottom of the page .

At the end of the day , it gets dark .

05-17-2006 Over year old.
Rob_T

Elite Veteran

..

One bit of unhappy news to point out is that if it's a starting battery (as you were told), then it will not tolerate many deep cycles before giving up.

05-17-2006 Over year old.
dcbinkowski

Senior Heliman

Lombard, IL - USA

I don't think I am planning to deep cycle it really.

Being an 18.6 Amp battery, I probably couldn't use more than 6 or 7 amps in a day of flying. Then I'd take it home and charge it that night.


Here's a useful question since you're in a helpful mood. I thought my battery was at "full" charge at 13.8 volts. Its reading tonight is 12.68 amps. My 7 Ah battery is also precisely 12.69v. Yesterday after fully charging them both on my Triton, they were each about 12.82v. I'm glad that they are so similar in their behavior, but isn't the full charge supposed to be 13.8 volts?

05-18-2006 Over year old.
dcbinkowski

Senior Heliman

Lombard, IL - USA

Those 7 Ah and 12 Ah hobby batteries aren't deep cycle are they? Or are they ?

If they can last for years doing the job of charging things (at low amps) then why couldn't a larger utility battery do it even better?

05-18-2006 Over year old.
Rob_T

Elite Veteran

..

Most lead acid batteries sold for RC use are deep cycle so far as I know. Certainly the gel cell types are. It's just the specific battery that dcbinkowski has that doesn't sound like a deep cycle type (it's not sold as an RC battery).

05-18-2006 Over year old.
dcbinkowski

Senior Heliman

Lombard, IL - USA

No, my lawn & garden is definitely not a gel cell (liquid inside), and certainly can't be deep cycle considering its price. It is a sealed, maint free battery though, no plugs on top, doesn't leak if turned over (but I wouldn't exactly store it upside down either!)

Its not a big mistake I made. I can probably get 2+ years out of it anyhow considering how I pamper my batteries. I plan to keep it hooked parallel to my 7Ah box when at the field and draw power from both. It'll be such a shallow cycle it shouldn't take more than 1 - 3 amps from the 18.6 (depending on whether I bring my T-Rex that day. I also have a 25 amp regulated DC supply at home so I only charge from my field batteries at the field (so my lead acids get less cycles).

When it does finally die I'll just install two 12 Ah batteries in its place, or one larger gel cell with nearly as many Amp hours. This 18.6 Ah battery was only $26 (+$5 disposal fee), even less than the cost of one 12 Ah battery at Fry's electronics ($39 !).

05-18-2006 Over year old.
dcbinkowski

Senior Heliman

Lombard, IL - USA

You can ignore my 13.8 volt question. I was looking at a paper on charge voltages, not the voltage reading you'd get once fully charged and disconnected. I have done some more reading today and it does appear that gel cells are the best choice (AGM okay also). But most gel cells have good recovery from deep cycling, and they're less volatile in terms of gas explosions, leakage, etc.

V Pct
12. 7 - 100%
12. 4 - 75% *
12. 2 - 50%
12. 0 - 25%
11. 9 - DISCHARGED

* sulfation can occur below this point

Like I said, I'll keep my wet cell for now and see how long she lasts doing what I do. Maybe I'll be surprised and get 3 years out of it. Then again, maybe my obsessive compulsive nature will force me to dump my perfectly good battery for an "ideal" gel cell by PowerSonic. Not that I've given it much thought. :-)

This baby is 21 Amp Hours! Only a half pound heavier (and within 1/10th of an inch) of the 18 Ah.

Powersonic 12v battery
PSH-12180 - 12v - 21.0 Ah - 7.14"L + 3.03"W + 6.59"H + 13.3 lbs.

05-18-2006 Over year old.
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What is the amp hours of this battery?

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