Yeaaaaaa Buddddddy!!!

[jruiz]

What kind of charger are you using? If like you said that this is the first time you've taken the battery this far down then I can think of two scenarios:

1. If you have a constant current->constant voltage charger where all this time you've only operated in the constant voltage range and the current draw in that mode is relatively low.

2. You have a charger that only does constant voltage and the current draw in that mode can be high for a depleted battery.

In addition, I presume that you are using a ~10Ah battery? If you are charging at rates approaching 5A then you might be reducing the life of your battery.

[jorluivil]

Originally Posted by jruiz

What kind of charger are you using? If like you said that this is the first time you've taken the battery this far down then I can think of two scenarios:

1. If you have a constant current->constant voltage charger where all this time you've only operated in the constant voltage range and the current draw in that mode is relatively low.

2. You have a charger that only does constant voltage and the current draw in that mode can be high for a depleted battery.

But how would the size of the fuse affect it's ability to charge?

[jruiz]

Originally Posted by jorluivil

But how would the size of the fuse affect it's ability to charge?

Let's say your charger is a CC/CV charger which charges at 4A up to 11.9V then holds the voltage at 12.0V until the current reaches 100mA. You may not have been discharging the battery low enough for it to require it to need to go to the CC portion of the charge cycle.

See a typical CC/CV charge cycle below. My theory is that you were formerly working in the I2 region during normal day to day use with you old fish finder. In your case I1>3A>I2

[ful-rac]

If your blowing that fuse your definitely drawing more than 3 amps, ok we'll assume you dont have a short. Since your battery is completely dead, it'll draw as much as your charger is going to put out assuming its in good operating condition, and if thats 3+ amps your fuse is going to blow. If your charger puts out a max of 5 amps with a completely dead battery, with a 3 amp fuse installed....=blown fuse. Half charged battery, charger might put out half the amps or less 3amp fuse ok.

I think your ok jorge, carry on!

[jorluivil]

I'm up to 75% charging and changed the fuse back to 3amp.....no issues. Thanks for the information, need to make sure I don't drain the battery.

[jruiz]

Originally Posted by jorluivil

I'm up to 75% charging and changed the fuse back to 3amp.....no issues. Thanks for the information, need to make sure I don't drain the battery.

I'm interested in knowing how long it took to go from 0-75%,0-100%, and the rating of your battery.

[jorluivil]

Originally Posted by jruiz

I'm interested in knowing how long it took to go from 0-75%,0-100%, and the rating of your battery.

0-75% - approximately 60minutes
0-100% - still waiting

Battery: 12v 10aph

Charging it using this charger
Settings:
12v
6A

[jruiz]

Originally Posted by jorluivil

0-75% - approximately 60minutes
0-100% - still waiting

Battery: 12v 10aph

Charging it using this charger
Settings:
12v
6A

I have the same charger. I would suggest using the 2A setting and leaving it overnight. Even for a depleted battery it should take a little more than 5 hours accounting for the CV portion of the charge cycle.

C/1.7 is really too high of a charge rate for a battery like that. 6A is their suggestion for truck batteries. The size we're using are what's common in ATVs and jetskis or in the case of the charger I think they use motorcycle or lawnmower as an example for the 2A setting.