My 15 volt 1 amp charger is no longer worker, can I use a 12 volt 1 amp charger?

[holden j caufield]

Will it hurt my device? It's a tennis ball machine and the charger is supposed to charge the batteries in it. Thx

 

[ALIVE]

Will it hurt my device? It's a tennis ball machine and the charger is supposed to charge the batteries in it. Thx

it wont charge them

 

[holden j caufield]

it wont charge them

even if I leave it charged for a longer time?

 

[ALIVE]

even if I leave it charged for a longer time?

to charge a battery you need more voltage than the voltage of the battery
so if you already have a 15 volt charger that points to a 12 volt battery thus
12 volt charger will not charge it

you need a difference of volt to charge the battery

 

[Billb2]

Electricity won't flow uphill.

 

[holden j caufield]

thx, learn something new everyday. So my 15 volt 1 amp charger stopped working, I hooked up a multimeter to it and it says it's 20 volt! What would cause this, and what are the chances I hosed my battery?

So I bought this universal laptop charger even though I'm only charging a tennis ball machine because it's 15v and has the 5.5mm 2.5mm tip I need. Usually laptop chargers are 3+ amps but this charger doesn't state anything. Are these smart chargers and will they auto adjust?

http://www.amazon.com/gp/product/B00849BPFI/

Thanks

 

[ALIVE]

thx, learn something new everyday. So my 15 volt 1 amp charger stopped working, so I hooked up a multimeter to it and it says it's 20 volt! What would cause this, and what are the chances I hosed my battery?

So I bought this because it's 15v and has the 5.5mm 2.5mm tip I need. Usually laptop chargers are 3+ amps but this charger doesn't state anything. Are these smart chargers and will they auto adjust?

Thanks

you need a charger capable to handle the batteries you have
lead acid??
lion??
lifepo4??
niCd??

each battery has different volt at which it is charged.
and batteries have a maximum safe volt charged.
a 12 volt lead acid battery is consider charged when it reaches 14,5 volt and never must go beyond 15 volts.
so what the charger is doing is measuring the voltage of your batterie to know when to stop
wrong charger and the charger will keep sharging and kill your batterie

if you charged them at 20 volt
well pretty sure they are gone

 

[holden j caufield]

hmm my knowledge of this stuff is pretty laughable

the tennis ball machine uses 2 of these batteries sla

http://www.azbatterystore.com/Tennis_Ball_Machine-12_Volt_9_Amp_Battery.html

they say 12 volt.

 

[phucheneh]

you need a charger capable to handle the batteries you have
lead acid??
lion??
lifepo4??
niCd??

each battery has different volt at which it is charged.
and batteries have a maximum safe volt charged.
a 12 volt lead acid battery is consider charged when it reaches 14,5 volt and never must go beyond 15 volts.
so what the charger is doing is measuring the voltage of your batterie to know when to stop
wrong charger and the charger will keep sharging and kill your batterie

if you charged them at 20 volt
well pretty sure they are gone

You are confusing battery voltage with charging voltage. 12v lead acid is nominally 12.6v fully charged. Charging voltage is typically 13.8-14.4. Sustaining charge requires something more in the 13ish range.

One that is charged at 15v+ until death will still only read in the 13v range.

edit: and if that link is correct, 15v would smoke that battery. Even if it's actually 12v instead of 12.6, a car battery charger should work fine. If you wanna be ghetto, start your car and hook it up like you would if jump-starting. Just don't blame me if you short something and start a fire. Or blow up the battery.

 

[lxskllr]

hmm my knowledge of this stuff is pretty laughable

the tennis ball machine uses 2 of these batteries sla

http://www.azbatterystore.com/Tennis_Ball_Machine-12_Volt_9_Amp_Battery.html

they say 12 volt.

Could be 24v.

Edit:
nvm. You already said the charger was 15v, and I assume that's what came with it.

 

[who?]

If your original charger was 15 volt that means you need that much electrical pressure to stuff electrons into that battery.

 

[phucheneh]

If he's looking for a household AC>DC adapter, 14v's are pretty available. I'd scavenge one from a broken LCD or something and solder the end from the old adapter on.

Speaking of which, your old one might not be dead. It's pretty easily fixed if there's just a broken wire in the cord.

 

[ALIVE]

You are confusing battery voltage with charging voltage. 12v lead acid is nominally 12.6v fully charged. Charging voltage is typically 13.8-14.4. Sustaining charge requires something more in the 13ish range.

One that is charged at 15v+ until death will still only read in the 13v range.

edit: and if that link is correct, 15v would smoke that battery. Even if it's actually 12v instead of 12.6, a car battery charger should work fine. If you wanna be ghetto, start your car and hook it up like you would if jump-starting. Just don't blame me if you short something and start a fire. Or blow up the battery.

the full load of lsa will be 13,8 but when you start taking amp it wiill fell to the working 12.6 volt the tiny amount of amp taken it will fell to that volt
thats how you understand the batery is full
when fully charged it climps the volts a bit
a well charged battery should say more than 12,6

 

[phucheneh]

the full load of lsa will be 13,8 but when you start taking amp it wiill fell to the working 12.6 volt the tiny amount of amp taken it will fell to that volt
thats how you understand the batery is full
when fully charged it climps the volts a bit
a well charged battery should say more than 12,6

...no.

If a car battery is more than 12.7-12.8v (again, 12.6 is the intended point of full charge, but they can go a slight bit higher), it is either overcharged, or you are seeing surface charge. And the voltage should not drop under load. The only general exception is engine cranking.

 

[ALIVE]

...no.

If a car battery is more than 12.7-12.8v (again, 12.6 is the intended point of full charge, but they can go a slight bit higher), it is either overcharged, or you are seeing surface charge. And the voltage should not drop under load. The only general exception is engine cranking.

http://www.batteryspace.com/prod-specs/SLA_12V70Ah.pdf

i rest my case

 

[phucheneh]

Please, PLEASE keep your car battery charged to 13.3v, or whatever that graph says.

Report back and let me know how that goes for you.