Hi, All;

I posted this on the Zenith Builders FB page, but the only info offered was that I bought a cheap battery and I should go with Odyssey.

I installed a Powersonic battery in my Cruzer, the model number as spec'd in the Zenith plans. Always follow the plans, right?!?   ;-)

I'm not yet flying. I have not even connected the battery to the airframe/avionics yet.

As I'm getting real close to finishing my wiring and connecting the battery, I thought that it's been a few months since I received the battery, so I checked it's voltage.  It was running 10.xx volts.  Hmmm... well, ok, I never charged it so do that first.

After a few hours, I checked again, and the voltage was 13.45 VDC, right about where it should be. Then within the hour it was 12.5 v, and continued a slow drain down. It's in the low 11's now, about 48 hrs after charging.  Remember - it's not connected to anything.

Bum battery, or is this typical of this make/model?

Views: 137

Reply to This

Replies to This Discussion

Which Powersonic battery are you using?  Is it a lead acid battery or lithium?  If lead acid, is it a sealed battery.  A  few hours is not typically enough time to properly charge any battery.  Also, are you using the proper charge for that battery?

Don’t recall the model. I’m at the drs so can’t chk. 1280? It’s about 8x7x2.5. Sealed lead acid. Few is relative. May have been 4-6 hrs. I use a taper charger. Starts at 12A for cars, but this started at 2A tapering down time barely above zero.

I would slow charge it for at least a few days to give it a good base charge. Then, always keep it on a maintainer/power supply when powering the avionics/lights/etc..

I'd charge at whatever rate, and however long, the manufacturer recommends.  What is the shelf date on the battery?  If the battery sat to long in a discharged state, it could prevent a battery from holding a charge.  The lead plates sometimes need an equalizer charge, but use caution.   

Thanks for making me think through some items, Loren.

It is a Model PS-12180 (left out the "1"). While PS recommends their own chargers, the charging cycles spec'd are within the range of my charger. More interesting is the shelf life specs on their tech sheets - 80% at 6 months on the shelf. My battery was made 3/21/2020, and I purchased on 6/19/2020, so it's 7 months old and was never charged by me. 80% of 13.45 volts is 10.76, right about where it was reading. I may do as suggested above and put it on a nice slow charge for a few days. And here I thought that once the charger needle was almost to zero that I was done.


New from Zenith:

Zenith Planes For Sale 

Classified listing for buying or selling your Zenith building or flying related stuff...

Custom Instrument Panels
for your Zenith

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, Dynon and Garmin avionics, and more.

Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits

Zenith Apparel from EAA:

Zenair Floats

Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz

Builder & Pilot Supplies:

How to videos from HomebuiltHELP.com

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.

Aircraft Insurance:


West Coast USA:

Pro Builder Assistance:


Transition training:

Golden Eagle Aviation

Pianosa Flying Farm

Aircraft Spruce & Specialty for all your building and pilot supplies!

© 2021   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service