Interesting lead crystals in St Pierre's troopy

**Robmacca** · 16th August 2017, 07:22 PM

Originally Posted by drivesafe

Hi Rob, can you post up details of your planned setup?

I'm currently installing a 2nd battery in my '95 Defender and I've bought a 110aH AGM battery as it's the biggest size that will go in under the seat and I can still refit the steel cover lid. The plan is to try and keep it simple and hopefully fairly cheap by just using a 140amp VSR to connect the 2 batteries. Well, that's my current thinking plan anyways

**ozscott** · 16th August 2017, 07:31 PM

I have a 110AGM. Gr8 size for fridge and LED work lights combined. Cheers

**drivesafe** · 17th August 2017, 04:52 AM

Hi again Rob, are running an electric winch?

**Robmacca** · 17th August 2017, 09:14 AM

Originally Posted by drivesafe

Hi again Rob, are running an electric winch?

Yes, that is the plan.... Does that change things at all?

**drivesafe** · 22nd August 2017, 10:30 AM

Originally Posted by Robmacca

Yes, that is the plan.... Does that change things at all?

For winch use, you do need to consider the type of auxiliary battery if you wish to link it to the cranking battery while winching.

**drivesafe** · 22nd August 2017, 10:41 AM

Ok folks, I am now carrying a number of different size Lead Crystal batttteries, but I will start a thread on them in the Verandah Section, over coming weekend.

Here is some very interesting info I Got from the owner of Lead Crystal Batteries today while I was picking up my first consignment of Lead Crystal Batteries.

Lead Crystal Batteries can be fully charged with alternator voltages from 13.6v to 14.8v.

Plus ( and this is the really interesting info supplied ) Lead Crystal Batteries can be SAFELY charged with up to 800% of the rated Ah.

Meaning, a 100Ah Lead Crystal Battery can be charged with an 800 amp input. This means they can take every bit of UNUSED alternator output.

That's pretty incredible!

**ozscott** · 22nd August 2017, 10:51 AM

Hell...Interesting tech.

Cheers

**austastar** · 22nd August 2017, 12:03 PM

Hi,
Do they need/use a temperature probe/sensor at full Amps charging?
Cheers

**drivesafe** · 22nd August 2017, 03:21 PM

Hi Austastar, if you were using a dedicated high current charger, then yes you would need to monitor the battery temperature.

In the typical RV setup, because you are never going to have such high charge currents available, then no.

As I have posted, I have been testing these batteries, and in one test, I was initially charging the a 70Ah Lead Crystal Battery with 53 amps at 14.0v and at no time during this charge cycle did the battery temperature rise above the ambient room temperature.

Note, most AGMs ( Optimas are one exception ) must not have a charge current greater than 20 to 35% of their rated Ah yet I achieved a charge rate starting at about 80% or 2.5 times what is safe for the best type of AGMs.

**Robmacca** · 22nd August 2017, 04:59 PM

Originally Posted by drivesafe

For winch use, you do need to consider the type of auxiliary battery if you wish to link it to the cranking battery while winching.

The plan was only to link them together via an H/D manual switch "if" the main battery ever goes flat & I need to start the car....

What things do I need to consider in regards to Aux Battery Type? I'll be running an AGM Aux & I believe the AGM's don't like heavy current draws due to the possibility of damaging them - Is this correct or am I well off the mark??

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