#1  
Old 18-03-2018, 10:58 AM
nobby2's Avatar
nobby2 (Neil)
Registered User

nobby2 is offline
 
Join Date: Mar 2014
Location: Norah Head, Central Coast, NSW
Posts: 150
Is this battery suitable?

After less than an hour use my RA stops working. My voltage gauge tells me about 8v despite starting fully charged at 11.9 v.
Is it normal for the RA to stop while the Dec keeps working with power issues?
I have attached the specs:
DiaMec
DM 12-18 (12v 18AH/20HR)
Sealed rechargeable battery
Constant voltage charge
Cycle use: 14.4 - 15 ov
Standby use: 13.5 - 13.8 v
Initial current: less than 5.4

When I attach my HEQ5 pro mount directly to the power its back to normal operation.

Purchased at JayCar
Attached Thumbnails
Click for full-size image (2CBDCEC6-B3F9-4ECA-BA10-036CB6DD455B.jpg)
194.6 KB42 views
Reply With Quote
  #2  
Old 18-03-2018, 11:12 AM
redbeard's Avatar
redbeard (Damien)
Registered User

redbeard is offline
 
Join Date: Nov 2010
Location: Adelaide
Posts: 424
HI Nobby2,

If the battery fully charged is 11.9 volts, then it is faulty to start with. It should be at the very least reading over 12 volts.

When SLA battery's get to 9 volts, they are unusable. Never let a SLA battery go below 12 volts.

I'd take it back to Jaycar.

Cheers,

Damien.
Reply With Quote
  #3  
Old 18-03-2018, 02:12 PM
markas (Mark)
Registered User

markas is offline
 
Join Date: May 2012
Location: Melbourne Australia
Posts: 281
Hi,

I've had one of these 12V 18Ah fail like this - definitely unusable.

I put it down to having accidentally charged it at too high a rate. According to the info on my charger it should be charged at 2 amps max.

Mark
Reply With Quote
  #4  
Old 18-03-2018, 04:58 PM
xelasnave's Avatar
xelasnave
Gravity does not Suck

xelasnave is offline
 
Join Date: Mar 2005
Location: Tabulam
Posts: 12,930
Never drop past 12 vlts and charge at max of 10% of capacity of battery...
Estimate what you need and buy battery that drains only 15% if you use that amount.
It is best to get bigger than less as best policy with rechargable lead acid batteries and to under use it. And out in the cold is not good for a battery.
And dont leave it sitting on a cold floor when not in use.
Keep it clean particularly the surface between terminals...mmm yes all over ..put your multi meter on a terminal and on the surface of the battery and you may get a surprise at the reading when dirty.
Alex
Reply With Quote
  #5  
Old 18-03-2018, 05:06 PM
xelasnave's Avatar
xelasnave
Gravity does not Suck

xelasnave is offline
 
Join Date: Mar 2005
Location: Tabulam
Posts: 12,930
My figure of 15% drain seems very conservative as we tend to think 25%..as it may be in a perfect world...15% on a cold night is all I like.
Alex
Reply With Quote
  #6  
Old 18-03-2018, 05:12 PM
luka's Avatar
luka
Unregistered User

luka is offline
 
Join Date: Apr 2007
Location: Perth, Australia
Posts: 1,100
You can get a deep cycle battery. Then you will be able to drain it safely more than 15%-25% that Alex mentioned.
Reply With Quote
  #7  
Old 18-03-2018, 05:36 PM
Merlin66's Avatar
Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
 
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,014
I have two “golf buggy” 20aH gel cell batteries which I bought back in 2007. I have a triple stage charger....
These are still as good as the day they were bought.
Never any issues with the HEQ5.....
Reply With Quote
  #8  
Old 18-03-2018, 05:41 PM
Marke's Avatar
Marke (Mark)
Registered User

Marke is offline
 
Join Date: Nov 2009
Location: Sydney
Posts: 1,193
You need to be using a deep cycle whether it's an AGM or Gel they are built to go below 50% better one even lower and will survive just fine that's what they see designed to do.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

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

Forum Jump


All times are GMT +10. The time is now 08:22 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Celestron Australia
Advertisement
Meade Australia
Advertisement
SkyWatcher Australia
Advertisement
Lunatico Astronomical
Advertisement
NexDome Observatories
Advertisement
OzScopes Authorised Dealer
Advertisement
Astronomy and Electronics Centre
Advertisement