Question is for info only, I’ve already solved charging problem w/ new altenator.
Problem - Dead car battery. Fully charged “battery booster” not enough power to start car. Jump from another car starts my car fine.
If I connect a fully charged booster battery to dead battery for 1/2 hr. without starting car…then fully charge battery booster again 12-24hrs until fully charged. Then next day connect booster to dead car battery & start car, this seems to works fine.
Question 1)Am I damaging my car battery in anyway by connecting booster to dead battery for 1/2 hour? 2) Is this a good solution to an underpowered battery booster?
You are not going to hurt that battery by connecting the booster, you are just applying 12V to that battery.
What I don’t understand is why you need to leave it connected that long, my booster will start a car with a dead battery immediately.
Thanks for the quick response…The battery booster I bought happens to be the least expensive $43. It doesn’t have the “amp capacity” of a more expensive one so the car still won’t start if car battery is completely dead. Thus I’m asking if my alternative way makes sense & will not cause any damage?
That makes sense, I do not believe what you are doing will cause any damage.
You will not damage the battery by doing that, although you could damage the booster battery. However allowing any battery to go totally dead, can damage the battery.
are you certain the dead battery was caused by a bad alternator… and not the other way around???
it sounds suspicious that you have to leave the boost battery hooked up for more than 30 seconds or so. it sounds to me that you have a bad battery, with a defective cell, which is NOT holding load, or holding enough amps to crank properly, and it is then killing the alternator.
another way to think about it, is you just paid $43 for a “boost” battery, it may be that what you needed was a new battery in the car. either get a load test done, or buy a load tester and do it yourself, then if this happens again you can test the battery yourself. (i think autozone will test the battery for you if you bring it in.)
the boost batt has the amps necessary to quick start a car. (as long as it is fully charged to start with) the cables may be loose on the booster, so it is not getting good contact with the terminals.
the jumper cables probably have a better connection.
it appears to me that you are saying you have to charge the booster TWICE to get enough electricity into the car battery. that doesn’t make sense. either the booster has enough jiuce to get the job done, or not. waiting 24 hours to reconnect it ??? why? how many amps is this boost battery??
“how many amps is this boost battery??”
That’s a good question. FWIW, mine is 17 Amp-Hr with 900 peak amps, and it is capable of starting my (diesel) engine several times on a single charge. As I recall it cost about $100 at the local parts place.
Booster is only 9 Amp-Hr (therefore not enough power) w/ 975 Peak amps. Manufacturer states the peak amp is only for 1/10 of a second.
So yes, on a completely dead battery I in essence have to charge the booster twice to get enough power to start the car.
Booster is only 9 Amp-Hr (therefore not enough power) w/ 975 Peak amps. Manufacturer states the peak amp is only for 1/10 of a second.
So yes, on a completely dead battery I in essence have to charge the booster twice to get enough power to start the car. If battery is just partially discharged the booster will start the car!
Thanks,…the battery is 7 months old. walmart tested system - battery ok, stated problem was in charging system. Testing was done free of charge as well. (good tip for others customers)