Is It OK To Fill A Dry Battery With DI Water Only?

Reply

  #1  
Old 06-17-19, 06:40 AM
Member
Thread Starter
Join Date: Sep 2011
Location: usa
Posts: 99
Received 1 Vote on 1 Post
Is It OK To Fill A Dry Battery With DI Water Only?

My C240 has sat unused for the better part of a year, I found the battery was bone dry of any acid. There's nothing wrong with the car it's just rarely driven now. The bat. was getting discharged/or unable to hold a charge. Reason, popped the caps and found it had zilch bat. acid. Not even a drip, in any of the cells. Refilled with DI water and all cells test about 2ish volts. I don't want to give up on it yet. It's an AGM type about 3 years.

Question is I know we can refill with DI water when acid is running low but can it be filled with no acid but DI water only?
If I have to buy acid how much is needed to fill a 12v Group Size H8, 900 CCA battery?
 
Sponsored Links
  #2  
Old 06-17-19, 07:19 AM
Member
Join Date: Jan 2011
Location: USA
Posts: 4,438
Received 24 Votes on 20 Posts
While I'n no expert on battery's , I've own several AGM battery's and not one had removeable caps, or had water in it.
Just a tiny vent on top.
https://lateral-g.net/agm-battery-maintenance-care/
 
bambata voted this post useful.
  #3  
Old 06-17-19, 08:06 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 52,627
Received 339 Votes on 317 Posts
The acid doesn't evaporate..... it's the water in the acid that you lose.
With the battery being dry for so long..... it may not come back to full capacity.
 
  #4  
Old 06-17-19, 08:53 AM
Member
Thread Starter
Join Date: Sep 2011
Location: usa
Posts: 99
Received 1 Vote on 1 Post
OK. I added DI water and it's slow charging. Will see if it's bubbling in 12 hours
 
  #5  
Old 06-18-19, 03:24 PM
Member
Thread Starter
Join Date: Sep 2011
Location: usa
Posts: 99
Received 1 Vote on 1 Post
Nothing happened, batt. is toast. Thanx for your ideas guys.
 
  #6  
Old 06-18-19, 03:48 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 52,627
Received 339 Votes on 317 Posts
The plates became sulfated and that's equivalent to a short across the plates.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes
 
Ask a Question
Question Title:
Description: