high charging voltage

Ken is right about lithium batteries they tend to recharge to fast and overload the Rotax voltage regulator.  I tried a lithium battery, it damage my regulator and wiring so I went back to a AGM Odyssey PC625. To me the light weight is not worth the associated charge problems and fire danger.

I have been running the EarthX for many years and it has never damaged my voltage regulator. I do not have any extra alternator, only the built-in Rotax generator. After I start, the charging current jumps up to 10-11 amps, but no higher. EarthX may be unique in that their batteries have a very sophisticated protection circuit built-in to the battery. 

Garrett Wysocki wrote:

Ken is right about lithium batteries they tend to recharge to fast and overload the Rotax voltage regulator.  I tried a lithium battery, it damage my regulator and wiring so I went back to a AGM Odyssey PC625. To me the light weight is not worth the associated charge problems and fire danger.

To be clear, I never meant to suggest that a lithium battery would cause harm to the voltage regulator. I was merely noting that one characteristic of lithium batteries is that they accept much larger charging current than lead acid batteries.

This plane is SLSA with weight issues and has had the lithium for many years . Conventional battery is not an option.

Here is an update. Aero batteries need a special charger but the factory guy said I could use a lithium maintainer. I don't think the battery liked it.

So I put the special charger on it  and it balances the cells. I have about 6 hours on it this week and it seems to work fine even with the Air conditioning on. Just kidding.

How much does your lithium battery actually weigh?  

On my aircraft the difference was only 3lbs.  My lithium battery died, for reasons unknown, and was not rechargeable.  A direct replacement would have had to come from Italy, by boat (not air transportable!), so I switched to an Odyssey, which is still going strong after two upstate NY winters outside.