Thread: Lithium Aux Battery?

Originally Posted by John_D4

I’m aware that generally lithium doesn’t like being under bonnets, but I’m thinking about replacing my under bonnet SSB dry cell with one of these lithiums. I already have a Projecta IDC25X DCDC’s, and I’ve thought about making an aluminium surround for the aux to give it some heat protection.

No, I’m not moving my battery into the rear of my car!

iTECH54 12v 54Ah Lithium Ion Battery - LiFePO4 Deep Cycle Camping RV S

Do they work with Traxide?

Originally Posted by Parso

Do they work with Traxide?

I removed my Traxxide aux battery controller in favour of the IDC25X as I’ve been planning a lithium upgrade and adding solar. A good solar controller was going to set me back about the same price as the IDC25X with the benefit of it being an all in one DCDC and solar controller

Not sure if you’re aware or not, but lithium needs a constant high charge rate which Traxxide cannot do

Originally Posted by John_D4

I’m aware that generally lithium doesn’t like being under bonnets, but I’m thinking about replacing my under bonnet SSB dry cell with one of these lithiums. I already have a Projecta IDC25X DCDC’s, and I’ve thought about making an aluminium surround for the aux to give it some heat protection.

No, I’m not moving my battery into the rear of my car!

iTECH54 12v 54Ah Lithium Ion Battery - LiFePO4 Deep Cycle Camping RV S

Rather than an aluminium surround you could use one of the adhesive heat blankets. Should give better insulation than aluminium but would have to re-do for each battery.

Originally Posted by John_D4

I’m aware that generally lithium doesn’t like being under bonnets, but I’m thinking about replacing my under bonnet SSB dry cell with one of these lithiums. I already have a Projecta IDC25X DCDC’s, and I’ve thought about making an aluminium surround for the aux to give it some heat protection.

No, I’m not moving my battery into the rear of my car!

iTECH54 12v 54Ah Lithium Ion Battery - LiFePO4 Deep Cycle Camping RV S

NOPE!!! Thats not rated to go under there, the BMS wont handle it....

I have their 120X under the nose of the nose of the D4 its rated for it...

As an aux battery Tombie, not a starting battery. It’ll be on a Traxxide aux battery mount where the European diesel heater space is.

Originally Posted by John_D4

As an aux battery Tombie, not a starting battery. It’ll be on a Traxxide aux battery mount where the European diesel heater space is.

Thats probably even worse a location than the aux compartment, box will need to be well insulated and maybe even ducted with fresh air.

Hi John and first off, your Traxide isolator is NOT the limiting factor when trying to charge lithium batteries directly from a D4 alternator.

The D4 comes with a SMART alternator operation and will stop charging a lithium battery and the BMS in a D4 will actually cause the D4 to run its electric off the lithium battery while your are driving.

In D3s and the original defenders, you can charge lithium batteries directly off the alternator through a Traxide isolator.

Next, your idea of an aluminium battery box is far superior to a thermal blanket, because any heat that will get to the battery, particularly on long drives, will keep in battery hot, long after the motor has stopped.

An aluminium box, fitted no closer to the battery than 10mm, will reflect the radiated heat coming from the motor but will allow any heat in the battery to quickly vent off once the motor stops.