Author Topic: Imbalance at Discharge (Read 153 times)

Peter in Fairfax, VA · « **on:** May 10, 2024, 09:34:39 AM »

Firstly, today was the very first time I charged an electric plane. I have very little knowledge of electric CL.

Today's bench run went well. The FM-9 time worked as expected with delay, then good power. I stopped the run after 15 seconds at full power.

The concern was when I went to discharge to storage voltage. The discharge aborted, noting an imbalance, perhaps 0.25v. I repeated the discharge, which is proceeding. Should it finish, looks like it will take six hours or so (0.45S rate, 3350 4S pack.)

Thoughts about the discharge concern, or other thoughts?

thanks,

Peter

Tim Wescott · « **Reply #1 on:** May 10, 2024, 03:09:52 PM »

Did you start with a pack that was fully charged with a balancing charge, or did you just plug in the pack as received from the vendor?

If you charged the pack on a balancing charge and it managed to get that far off in that little time, then there's a chance that it was a fluke, and a chance that you have a bad pack.

I'd keep an eye on that pack. Personally, I'd top it up with a balancing charge, then discharge it to storage, then check the cell voltages. If it can go through two or three cycles of that without a mismatch of more than a quarter of a volt then it's much more likely that it's a fluke.

Ken Culbertson · « **Reply #2 on:** May 10, 2024, 03:34:54 PM »

I have had this happen 2 or three times. No idea the cause. Maybe a bad connection on the balancing plug. My charger has a setting to simply "balance" whatever is there. That fixed it in every case. Mine occasionally get a high voltage on one cell. Balancing or a few seconds of discharge puts it back to where it will take a balance charge.

Ken

Carl Cisneros · « **Reply #3 on:** May 10, 2024, 04:07:46 PM »

Peter

check your messages.

Carl

John Rist · « **Reply #4 on:** May 11, 2024, 09:08:16 AM »

I would buy a 150W 3 in 1 Battery Balancer LCD Voltage Battery Discharger.

https://www.ebay.com/itm/173981196308?itmmeta=01HXM2K2XHS3JSGSW4GSAHSJN9&hash=item2882166014:g:OP4AAOSwei9kR1G~&itmprp=enc%3AAQAJAAAA8PcCHyxMi24gNN9Hy%2F18uEddI3fCbxCkQDpg%2FGjL7cLD9cfy2uTl04W40LqVuQ1oVK3yW8xx70i%2FCM683NngDVgJQgnLpzWMLcprprlUJIE6wIgho1Cgv6niDREHJRESzZY8D36hVYU9OXwdjSdT5URkUkxi%2FL0JkW6Qkq015V%2FEAihacIBawIskn8LUZqeBNlI4%2B8zzEPdlPJH6qSTN59d%2BUyS%2BMy6nVkdTSgpP7hTTIHzsO9hHdS8tPFTviq6vX5UIpCZll7fUytOU4c7ibAalo0%2FM2ROub9FYE3lWAPypHVKNaOa0r2EXcRSGvA6bfw%3D%3D%7Ctkp%3ABk9SR-6uzILtYw

Also you can get a fixture to hold the light bulbs.

https://www.ebay.com/itm/364633919699?itmmeta=01HXM2K2XHCZ1D2KMPEHZFEXP5&hash=item54e5e010d3:g:--MAAOSwQEFgvrqj&itmprp=enc%3AAQAJAAABEKI6hzjdnIVFXJv0jBZJSEx8vkxwpPUfuu%2FDzFFJOsU2oLkIdtQ8GJMzDJJoTQ%2Bh2sPdGS8IagXxBlbsCotCxN00BC66l%2BRcFFz%2Fja%2BOyN6Evr9B7z8OppmfFa%2Fa8DxqdItcjsAjT8K6S%2FkdlIMOZtgRWC4y3YavtGkzTmJkiG6Ghnae4PJj9ykYDi3P15pvOcz6qdGj%2Bal6z8Vq0Kohh2W7ZlrqCot0ZmBPBYa4X5SYpEAaE1vLxlPWBfG0eGqyyvnIX97iB%2Bta9HMeTe7aa8Ve1Oy0eJNWBEYXP%2Bcw1mUu5EfgpMThxsadbEsQM63JZweNaLhJc61rS5YzQaie9ToRm%2FGW31VTE54PIlf%2BYDWH%7Ctkp%3ABk9SR-6uzILtYw

I have 3 of them and they work well. I have 4 good flight batteries and a 4 battery charger. I charge all 4 batteries and go fly. If I get in only one flight I come home with 3 fully charged batteries. I put them on the 3 discharge units set for storage level. Takes 30 minutes or so and they are ready to put up. The battery I used goes back on the charger set for storage. Makes it all quick and easy.

Author Topic: Imbalance at Discharge (Read 153 times)

Peter in Fairfax, VA

Imbalance at Discharge

Tim Wescott

Re: Imbalance at Discharge

Ken Culbertson

Re: Imbalance at Discharge

Carl Cisneros

Re: Imbalance at Discharge

John Rist

Re: Imbalance at Discharge