battery

[blue]

I have 2 batterys I have got at the same time one is a 5lb and the other is a 7lb, The 7lb seems to have a better cranking charge and the 5lb has a better over all charge why is this. Im asking because im trying to decide if I should stay with the 7lb battery. Or with the 5lb.

[MotoRandy123]

Well batteries aren't usually rated by weight!
They spec AH and CCA.

AH is amps per hour that it can supply. My scoot uses a 10 AH battery
(probably a 5 pounder). This tells you how fast you can charge it and
how much extra capacity you have for running things beyond the power
 your bike makes.

  I could buy a 12 AH (if it will fit) and that would be a 7 pounder. It would
allow 2 amps more power or 24 watts (amps x volts). This extra capacity
is used say on a dark and cold night when you have your lights and heated
 grips on and are going slow so not making much juice.

 The CAA is cold cranking amps. A battery looses ability to supply power
when cold. It might supply 300 amps at 70F and only 190 amps at 32F.
 The CCA is how much it can supply at 32F.

 There are several ways to build a battery. The old fashioned lead acid just
floats lead in an acid bath. The AGM fills the liquid with Glass Mat material.
This makes the battery more consistent so it can supply more current and
last longer when drained.

  So your 5lb might be AGM and have 8AH but 200 CCA (more CCA so can try to start longer)
 and your 7lb might be lead acid and have 10AH but 150 CCA (more AH so can run more/longer
 on dark night with extra lights on)

Thus you can't go by weight but instead you need to check AH and CCA
(and type).

 There are other types beyond lead acid and AGM, like lithium and gel each
has unique qualities (and prices).

[blue]

Wow  a lot of info to take in,,,,,,,,thanks.....

[streido]

Yeah, basically if your battery is higher amps then as it runs down your scoots charging system may not have enough piwer to recharve the bigger battery to its full charge, especially in winter when you use more to crank it over and if you ride with lights on etc.

[mono]

There are too many variables to predict which one you should use.. (unless you want to dive into some books even deeper than Motorandy did  )

Specs alone won't tell everything since starting batteries are often operated uncomfortably near their limits and manufacturers can't give exact numbers anyway - there's always some uncertainty in production circumstances, differences in the way they measure their numbers, etc... Also one of those batteries might just be in a better condition than the other one, even if you've bought them at the same time...

I think it's best to charge them both and try them for a week each - time will tell  

[wordslinger]

..4ts are harder onna battery...during cranking...


...have you ran the 7lb with success??



..i'm curious??

[blue]

..4ts are harder onna battery...during cranking...


...have you ran the 7lb with success??



..i'm curious??

    I had the 7lb in the kymco for a short time I liked the cranking power the 5lb gives out is better.
                I think its 7lb just to hold more acid to give it more aux. power. I have the 5lb back inm y scoot and the 7
I use in the chinese scoot .

[wordslinger]

.cool, that's good to know...

[Vivo]

just get a good branded battery with the right spec....

[MotoRandy123]

Well they claim a motorcycle should have the same size battery as a car.
So you should have a 20 pounder in there! The 10 AH usually specs the size.
If a bigger won't fit it won't help. The CCA is usually the number for being able
to crank for a long time. When shopping for my tractor I found 150, 180 and 210
CCA's and went with the 210 (PS they were all the same weight!).

[wordslinger]

...cca= cold cranking amps..

...thats th key...


     

[mono]

I never had any problem with the standard 5..7Ah batteries, even in winter...

Well, the only problem being that they only last for 3..4 years, but I'm not sure a larger one would last longer, it will however, be more expensive, and also a headache to fit and connect...

[fshfindr]

I brought mine to Pep Boys and said that I wanted one like that.

Richard L.

[blue]

Must of been realy cold today had to call for a friend to come give my scoot a jump today scoot would not start when I got out of work. Guess I better give it a good charge once in a while.

[The Rookie]

AH is amps per hour that it can supply. My scoot uses a 10 AH battery
(probably a 5 pounder). This tells you how fast you can charge it and
how much extra capacity you have for running things beyond the power
 your bike makes.

AH has nothing to do with charge rate, deep draw batteries can have the same AH but are designed to be charged/discharged at a much lower rate than a vehicle battery used for cranking.