RunRyder RC
WATCH
 1 page 475 views Post Reply
HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › Thunder Power 2100's and Hobbico Accu-Cycle Elite
08-01-2007 05:39 PM  13 years ago
Topic Vote0Post 1
mlucia

rrKey Veteran

Essex Jct., Vermont

MyPosts All Forum Topic
Thunder Power 2100's and Hobbico Accu-Cycle Elite
I have triple checked all the settings on the charger yet it still takes 100 minutes to charge one of these batteries. My understanding is it would take around 1 hour to charge. I only fly 5 minutes per pack and the V-Balence says things are in check with no need for balenceing. Both packs are consistant with the same time to charge.

Charger is set for 11.1 V - 3 cell / 2100 Mah / 2.0 amp.

Anything i'm missing here or is this normal?

Many thanks!
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2007 05:49 PM  13 years ago
R/C Speed Nut

rrVeteran

Galesburg, Michigan USA

MyPosts All Forum Topic
That is a little long, but not unheard of.
How many MA are you putting back in the pack?

Mike

Funky Chicken?!!..........I thought this was how you do a piro flip!!
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2007 05:53 PM  13 years ago
mlucia

rrKey Veteran

Essex Jct., Vermont

MyPosts All Forum Topic
On the charger it is set to 2100....
Wait, Do you mean what it ends up with after the charge is complete or?

If so... i can't remember :-)
What would be a normal MA after charge?
thx for the reply
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2007 05:55 PM  13 years ago
ErichF (RIP)

rrElite Veteran

Sutton, NH

MyPosts All Forum Topic
Your understanding is not correct.

Once the pack reaches 12.4V, the charger (all lipo chargers) switch to a constant voltage charge, rather than a constant current charge.

Therefore, the old rule of thumb that charging at 1C should charge the pack in 1 hour doesn't hold water with Lipos. Once max voltage is achieved, the charger starts reducing current until the battery takes no more. That's the part that can take awhile. I have hovered over a charging pack as it's getting spoon-fed 0.08Ah for 20 minutes. Many times I'll just pull a pack off once it's down under 0.10 Ah charge rate. Doing that can start an imbalance in the pack, so I don't make a habit of it every cycle.

Erich
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2007 06:29 PM  13 years ago
mlucia

rrKey Veteran

Essex Jct., Vermont

MyPosts All Forum Topic
Thanks.

Ok, so this is normal then to take an average of 100 minutes per pack then. This has held true for approx. 8 charges and is always the same. Didnt know if there was a way to speed up the process :-)

Many thanks!
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-01-2007 10:57 PM  13 years ago
ErichF (RIP)

rrElite Veteran

Sutton, NH

MyPosts All Forum Topic
No, you can't speed up the last part of a Lipo charge cycle. The battery determines the rate and thereby how long.

My concern is that you may be discharging the packs a bit too much. Your low voltage cutoff on the ESC should be set to 70% or at least 65%. Next time you charge, see how many mAh the charger stuffed into the pack. If you are very near, or even over, the spec capacity of the pack, you're going too far. With a TP2100, you want to see around a 1900-2000 mAh recharge. That being said, I have pushed mine a bit far, and got nearly 2200 back into them

The Accucycle charger is a great, all-around charger. I just bought a second one recently because one side of my 2-yr old one got wet and doesn't work. I also bought 3 of them for the shop at work to charge our various UAV aircraft batteries. For $130, you can't beat the features and versatility, not to mention DUAL outputs...a feature not found on $400 chargers.

Erich
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-02-2007 04:34 AM  13 years ago
MEDFLIGHT

rrVeteran

South Webster, Ohio

MyPosts All Forum Topic
Are you trying to charge 2 packs at 2 amps at the same time. The power supply that comes with the Elite only has a 2.5 amp output so the combined charger output will be slightly lower. When charging two packs the max you can charge each pack is about 1.2 amps, maybe a little less.
SHARE  PM  EMAIL  Attn:RR  Quote
08-02-2007 11:29 AM  13 years ago
ErichF (RIP)

rrElite Veteran

Sutton, NH

MyPosts All Forum Topic
I know what the docs say, and what the supply says, but I HAVE routinely charged two 2100s at a time at 2Ah...at least that's what the charger said. I believe it, too, otherwise the charges would have taken a lot longer than they did.

I don't know why they list the supply current as only 2.5A...might be nothing more than precautionary labelling to make some lawyer happy.

Erich
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-02-2007 02:28 PM  13 years ago
mlucia

rrKey Veteran

Essex Jct., Vermont

MyPosts All Forum Topic
I also notice that you cannot set the amps higher then 2.0 on the charger when it recommends 2.1 or less for the battery (2100 / 3c / 11.1). Not that .1 would make a huge difference anyways.

Isnt the whole point of the charger to charge 2 packs with the same settings? Your saying it reduces the amps when charging 2 packs at the same time. Is that in fact true?

I dont think I am over discharging the battery when flying? Usually set the timer for 5-6 minutes. What is everyone else flying for flight time on these packs? This would be mild 3d...
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-02-2007 02:57 PM  13 years ago
ErichF (RIP)

rrElite Veteran

Sutton, NH

MyPosts All Forum Topic
Right, each output of the charger can deliver a max rate of 2A together. I have put two TP2100s on, dead, and charged both together at 2A, at least that's what the display was showing. This, on the included "2.5A" power supply. So, take that for what it's worth.

Erich
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
08-02-2007 05:21 PM  13 years ago
MEDFLIGHT

rrVeteran

South Webster, Ohio

MyPosts All Forum Topic
ErichF

You could be right. I very rarely charge over 1/2c and I only have 3s 2100's or smaller. My point was based on the specs only.

madcowvt
Isnt the whole point of the charger to charge 2 packs with the same settings? Your saying it reduces the amps when charging 2 packs at the same time. Is that in fact true?
IMO the point of the charger is to charge two packs at the same time regardless of the settings. I routinely charge two packs of different types/sizes with very different settings.
SHARE  PM  EMAIL  Attn:RR  Quote
08-02-2007 07:08 PM  13 years ago
Chief_USN

rrKey Veteran

Chesapeake, VA

MyPosts All Forum Topic
IMO the point of the charger is to charge two packs at the same time regardless of the settings. I routinely charge two packs of different types/sizes with very different settings.
I always charge different packs at the same time. I will charge my TX pack at the same time with my TP2100. I have never had a problem. I've done two different lipos also. That's the whole point of having two outputs.

I have charged my TP2100 at 2.0amps and the EDIT: TP205V balancer approx 20 times with an average of 90min and 2050mah getting put back into the pack. It might all be dependant on the balancer you're using.

Chad
Team HeliProz 12-14
US Navy Chiefs...Unity, Service, & Navigation to the Fleet since 1893
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 475 views Post Reply
HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › Thunder Power 2100's and Hobbico Accu-Cycle Elite
Print TOPIC

 2  Topic Subscribe

Sunday, September 27 - 11:28 pm - Copyright © 2000-2020 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online