RunRyder RC
 4  Topic Subscribe
WATCH
 1 page 602 views POST REPLY
Helicopter
e-
Electric Battery-Charger-pSupply
› If you are puffing or losing packs. Please verify balance of pack after charge
01-02-2013 03:21 PM  5 years agoPost 1
CoronaL

rrKey Veteran

Winnebago IL

My Posts: All  Forum  Topic

Most of you already know this, but it's good to throw out occasionally.

I've seen it happen almost every year with someone I know.

They start killing good brand name packs and start telling everyone how brand "X" packs suck. When questioning these people you get strange answers. Packs are puffing in 20-30 flights. Or it's always cell #2 or #4 or w/e, but the SAME cell each time. Smaller packs seem to manifest the issue earlier, all else being equal ie 2600mah 6s, vs 5000mah 6s, but this is assuming same type of flying style, abuse etc...

Anyway, if you have more than one pack die prematurely, or even after one pack being iffy, please do yourself and others a favor and check the balance of the pack after a charge. Your charger may report 4.20 or 4.18v etc... balanced across the pack. HOWEVER, if you put that same pack on another known good charger, you may find that the balance is off, often with one cell riding much higher ie 4.25v or higher. That OVERCHARGE is killing that cell. If the cell was lower ie 4.15 compared to the others at 4.18v that wouldn't be ideal, but the pack in general will be ok. OVERCHARGING lipos kills them. If it gets bad enough you could have fire hazard issues. I've seen this happen with many brands of chargers so I hesitate to name names, as I don't want a flame war, but I've seen it more with Hyperion, icharger, and Thunderpower chargers. Now maybe that's just b/c they are so popular by sheer numbers you will see more defects or problems. Also, some chargers allow the end users to reset or calibrate the balancers so there may not be the need to replace the charger, just perform some maintenance so to speak.

Furthermore, today's higher charge rates are harder on most chargers balancers as the circuitry can only handle so many watts in the balancer. I think Powerlab 6/8 have the beefiest balancers, but even so keep an eye out. Also, charging in parallel strains the balancer more and if you always charge in parallel you cannot see the true voltage of one single pack as w/e is reported via the charger is the combination of the packs in the circuit. I recommend occasionally charging packs singly to verify good balance, IR, etc...

Hope this helps.

Randy!!! I am the liquor

PM  EMAIL  GALLERY  Attn:RR  Quote
01-02-2013 07:22 PM  5 years agoPost 2
tomd27858

rrApprentice

greenville, nc usa

My Posts: All  Forum  Topic

Nice post and a good reminder.

Team HeliDirect

PM  EMAIL  Attn:RR  Quote
01-02-2013 07:57 PM  5 years agoPost 3
psych-lick

rrKey Veteran

Portland, OR

My Posts: All  Forum  Topic

Good post!

Also, since it's winter for most of the US I thought it might be a good idea to mention how temperature affects lipos.

As the temperature of a lipo drops, so does it's voltage and discharge energy. As it warms up the voltage will rise. So if you charge in a cold garage to 4.2 volts and then carry them to the field in your hot car you are damaging the cells.
FMA chargers, like the PowerLab, will automatically limit charging to 4.1 volts per cell instead of 4.2 when it detects the air temperature below 50 degrees for this reason (this can be modified or disabled in the options).

Also, when flying in cold temperatures it's a good idea to charge/fly/charge/fly without letting your packs cool down. When large packs are cooling on the table, the outside cells (ie, 1 & 6) will cool much faster than the interior cells. If you tend to not fly back-to-back it might be a good idea to put your packs in a cooler or wrap them in a towel to maintain similar cell temperatures across the pack.

-Jeff T.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-14-2013 01:16 AM  5 years agoPost 4
Richardmid1

rrProfessor

Leeds, England

My Posts: All  Forum  Topic

My old icharger 106b+ would go out of calibration and would have eventually prematurely killed my packs if I hadn't done some research and found you can calibrate them yourself! Im not sure if the newer ichargers still have this calibration drift problem as I don't use them anymore for this reason!

My hyperion 0730i And 1420i were extremely accurate, even more so than my PL6!

I disagree with what you say about charging in parallel as cells connected in parallel equalise to the exact same voltage as each other so the voltage you see on the screen IS the voltage of those cells. I would say though that it is good practice to charge new packs for the first few cycles individually so you know they balance well on their own before charging them in parallel.

60% of the time, it works every time!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 602 views POST REPLY
Helicopter
e-
Electric Battery-Charger-pSupply
› If you are puffing or losing packs. Please verify balance of pack after charge
 Print TOPIC  Make Suggestion 

 4  Topic Subscribe

Friday, April 20 - 11:23 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online