Batteries don't charge

ArmySFCRet wrote:
Not to sure about them coming back. On charge for almost two hours and voltage has dropped to 2.45. Giving them another two hours and then letting them rest until morning.

Leave the charger on them. Like others said, this is going to take DAYS not hours.

Yes, these are two 12 volt 27s. They were topped off with distilled water before I started. Down due to poor PM.

ArmySFCRet wrote:
Disconnected bats and now on external charger. Will wait and see. Using large roll away with gauges. Currently charging at about 18 amps.

On edit: after 45 min, now up to 20 amp charging rate. This is in low setting. Medium setting takes it to 39 amps.

These threads can get out of hand-and people don't read every post-what you suggest above sounds like a good plan-I've had similar experiences and you need to tackle both issues-why the batteries are dead, and charging them back up! My experience has been to top off the batteries with distilled water and then charge at the lowest rate possible-ideally for a few days-let them sit and rest and then charge again and then hit them with a good high rate charge after they've settled for a few days and are maintaining there charge. I takes the plates some time to 'remember' their job, hopefully there not toast and if they were just drawn down and not that old you'll be ok.

Just to confirm-and I'm being super simple minded-you have 12V batts and not 6s right?

pianotuna wrote:
Hi Mr Wizard,

168 hours = one week.

MrWizard wrote:
hours ?

these things will need DAYS !!!! to any kind of charge recovery

PT from the timing of the posts it looks like Mr Wiz was not responding to yours. Anyway, nobody has solved the OP's problem of why his solenoid is stuck or whatever so it doesn't keep happening even if he got new batts. Spray the solenoid with silicone spray? :)

Hi Mr Wizard,

168 hours = one week.

MrWizard wrote:
hours ?

these things will need DAYS !!!! to any kind of charge recovery

Let's hope there is water in them too. :)

BTW if the batts are really low, the charger's amps will start low and actually increase as the battery gets better, then eventually after completing "bulk" the amps will taper back down per usual.

hours ?

these things will need DAYS !!!! to any kind of charge recovery

Hi Army,

Charge them for 168 hours at 2 amps.

Not to sure about them coming back. On charge for almost two hours and voltage has dropped to 2.45. Giving them another two hours and then letting them rest until morning.

Hi,

Some Class C's use a perko switch instead of a relay. I prefer that. Cheaper and much easier to trouble shoot.

I suspect the batteries may come back--but will be shadows of what they were before they were given the knock out discharge.

BFL,

Too complicated for the charger king? I don't believe a word of that.