On Friday, May 8, 2020 at 3:21:11 PM UTC-4, John Silverberg wrote:
Hi,

I'm hoping someone with experience with K2 batteries can help determine if mine are due for replacement. I have dual K2 batteries wired in parallel to supply avionics power. I have an LX9000, S8 and V8 varios, trig transponder, FLARM core, and becker com radio running off them. I'm not sure how old they are but they're at least 3 years old as this is my 3rd season with the ship. Yesterday, after a little over 5 hours I got a low battery warning with the batteries at 11.3 volts. I had all the above avionics on but did virtually no transmitting on the com, just listening. They were fully charged at takeoff.

I'm not sure if this normal endurance for these batteries or not, any advice would be appreciated.

Thanks,

John S.

Hi,

Thanks for all the information, I have some good ideas to work from now. I use the proper K2 charger and usually charge the batteries overnight. Temperature may have been a player too as it was -17C at cloud base (over 10,000' very unusual for the Northeast) and the batteries are behind the rear bulkhead on a Ventus so I'm sure they were cold soaked.

Thanks again for all the info.