Not getting full charge Optipower 6s 5000

[Gazzer1uk]

It will be me but.........

bought 2 x 6s 5000 Optipower batts, psu and Fusion L172B charger. Pretty much took default settings though because garage is cold set voltage at 4.1 or 4.2 (.1 less than normal) as max charge.

Checked post charge and had 80% last time and only 70% this time! less than 5 charges so far.

any recommendations on settings for getting closer to a full charge?

Cheers,

Gaz

[jimmyhorns]

You need to check the individual cell voltages.... it could be that you have a bad cell, but thats unlikely in two packs at the same time...

might be worth someone with a different charger giving it a go for you, so you can rule out the charger as the problem.

[Mark_T]

Sounds like you are using one of the lipo checkers that displays a percentage value, ignore that and look at the cell voltage readings and see if they are what they should be given your reduced target voltage on the charger.

The percentage value is only an estimate based on the voltage, it isn't a measurement as such.

Post the individual cell voltages and people will be able to comment more helpfully.

[Dave Rand]

The charger hasn't got a cold weather setting (only charges to 80% to protect cells)
my cellpro 10s has caught me out a few times.
And I've turned to setting off on the Power lab.

[Gazzer1uk]

Cheers guys,

Just had a cheeky flight in the back garden so will charge up later.....

Yes the checker is as you have said MarkT so will check the voltage and see instead!

I'll update tomorrow!

Gaz

[Sesame]

also a good idea to check and see what your putting back in the pack to make sure your not going down into the last 20% of the battery.

[Gazzer1uk]

OK getting a bit weird.... results from my batter checker.....

Checking each cell results as follows Batt 1 Cell 1 3.932 Cell 2 3.947 Cell 3 3.944 Cell 4 3.947 Cell 5 3.946 Cell 6 £.945 total Voltage 23.66

Batt 2 Cell 1 3.956 Cell 2 3.957 Cekk 3 3.958 Cekk 4 3.958 Cell 5 3.961 Cell 6 3.955

Hmmmm upped the charging voltage to 4.2 noted it only put in about 60% but I disconnected before I took all the readings off the charger....... doh!

So to me does not look like a bad cell...... variations are minor but are they significant? Should I need to look at the capacity and defaults I am charging at?

Hopefully will still come down to user error!

Cheers,

Gaz

[Mark_T]

Packs look fine, but if those are the voltages after charging, you are not getting a full charge for some reason so we are either looking at faulty charger, or user error.

Right now I'm going with user error

I'm just going to go check the manual for your charger to see if I can spot a likely problem.

[cjcj1949]

Check your tester against a known good meter. You should be ending up very close to 4.20V on a normal charger in the warm. Only the cellpro has a cold weather setting of 4.1V. Lipos do not work well when cold and warming them to 20 to 30 degrees C will help. When you charge to a voltage that is the voltage while being charged at whatever current the charge stops at. When the charge stops the voltage will decrease immediately and it will also decrease slowly for a while. This is due to the internal resis. tance of the battery. The higher the end current and the internal resistance the greater this voltage drop.

In cold weather the battery will not last as long either unless used warm.

Some people think charging cold lipos is harmful. We do know that lipos last longer(do more cycles) when charged to lower voltages.

[Mark_T]

Could you check the model number of the charger, is it actually L712B ?

[Mark_T]

If it is the L712B then it has the ability to cut off the charge if it exceeds a defined percentage of the pack size, if you have entered the pack size incorrectly then it could be triggering an early termination of the charge.

Can you check and see what pack size you have set in the charger for these two packs?

[Gazzer1uk]

Hi Mark,

I will double check but confident it is set at 5000mah. I will go look at the menu and settings and list them in case some are incorrect.

Thanks for your help, and I am still going with user error or maybe ignorance at this stage lol! Thanks CJC too.

Gaz

[Gazzer1uk]

Stuffed the Heli on Sunday but only part way through a flight, so not forgotten about this, just not had chance to resolve as that flight was first chance to discharge!

I'll let you know soon!

Cheers,

Gaz

[Gazzer1uk]

Right then, Heli repaired and test flown, batteries just recharged, 60 and 61%. Voltages across them all 3.9 plus a bit each.... Hmmmmm.Charger is Fusion Emperor L 712B Pro.Settings are 6S 5000mah chg 5. Amp 4.2v charge per cell max discharge 5amp. charge cut temperature 55 (though no sensor so think this does not apply) max capacity 120% 120 min safety time charge rate 2C TCS Capacity 100%. TCS end act cont.Battery checker is Fusion smart guard 2.Any clues?Gaz

[coolice]

Hey budsy.

What firmware is the Emperor running? If it's an older firmware there was some balancing issues from memory of when I had the Emperor.
It could be a firmware reflash may fix the problem you're having.

It may be worth connecting to log view via your pc to monitor the charger during a charge;

Logic RC - Fusion L712B Pro Emperor II DC
.