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battery charging

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aloishis89

New Member
I have a 12 volt 18 amp hour battery and a 12 volt 9.5 amp hour charger that was originally for a different battery. Is it ok if I use that charger on the bigger battery? Since they are rated at the same voltage, I am guessing that it will just take longer to charge, but I wanted to make sure. The battery I want to charge and the battery that the charger was originally for are both sealed lead acid.
 

Sceadwian

Banned
If it's bigger yes, it will just take longer. Depending on the charger you just have to be careful if you use the charger for a larger battery on a smaller one.
 

colin55

Well-Known Member
I have a 12 volt 18 amp hour battery and a 12 volt 9.5 amp hour charger
Depending on the charger you just have to be careful if you use the charger for a larger battery on a smaller one.
None of this makes any sense.

Sceadwian - It is lucky you are not writing any technical books.
 
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Hero999

Banned
It makes perfect sense to me.

You can use a smaller battery charger to charge a larger battery than what it has been designed for but not the other way round.
 

Sceadwian

Banned
Colin, what doesn't make sense?
 

k7elp60

Active Member
I agree with Hero999
 

colin55

Well-Known Member
Firstly you cannot get a: "12 volt 9.5 amp hour charger." You can get a charger for a 9.5 AHr battery.
Secondly, you don't know what type of battery the charger is designed to charge.
You cannot connect "any charger" to "any battery." Even though the charging current may be low, the cut-off (cut-out) voltage is very important as some batteries are designed with a high "gassing voltage" and a charger for this type of battery, on a low gassing battery, will dry it out in 6 months.
 

ericgibbs

Well-Known Member
Most Helpful Member
I have a 12 volt 18 amp hour battery and a 12 volt 9.5 amp hour charger that was originally for a different battery. Is it ok if I use that charger on the bigger battery? Since they are rated at the same voltage, I am guessing that it will just take longer to charge, but I wanted to make sure. The battery I want to charge and the battery that the charger was originally for are both sealed lead acid.
This is not to difficult to understand, IF you read what the OP says:
I have a 12 volt 18 amp hour battery
The battery I want to charge and the battery that the charger was originally for are both sealed lead acid.
Since they are rated at the same voltage
and a 12 volt 9.5 amp hour charger
Which to me means a charger that was designed to charge the ORIGINAL 9.5AHr battery.

As 'Sceadwian' says its OK, it will just take longer to charge.
 

aloishis89

New Member
Yeah, I am sorry that my first post was confusing. To clarify, I have:

1. A 12v, 9.5 amp hour battery (sealed lead acid)
2. A charger for #1
3. A 12v, 18 amp hour battery (sealed lead acid)

I wanted to know if #2 would work with #3, and Sceadwian and ericgibbs both said that it should, but will just take longer to charge.
 

Sceadwian

Banned
Yes, it will take roughly twice the time, however you should monitor the charger itself for overheating, charger topologies are varied to say the least, if the charger was just barely able to charge the #1 battery safely then the extra time it takes to charge the #3 battery might be more than the charger can handle in the long run. Just keep an eye on it, I tend to err on the side of caution, even if unwarranted simply because you can't be too safe, you can however be not safe enough =)
 
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