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Old 05-28-2019, 09:01 AM
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I switched to A123 batteries 7 years ago and never looked back. I always balance charge them as it takes no more than 10 minutes anyway, sometimes on my way to the field. I use Life batteries too for smaller planes or ignition but I prefer A123's for the cell quality. I have had A123 packs left connected on Powersafe receivers for the winter that were drained down to 0 V and they charged up to full capacity without a hitch.

If you use the FMA/ Revolectrix Cellpro Multi4 or the Powerlab 8 you can charge through the balance lead only - no need for the positive and negative power leads.

Hangtimes has a battery lead/switch setup where you can charge through the power switch. Richard at Wrongwayrc.com has excellent battery packs PLUS many balance lead options that can be mounted on the fuselage for external charging without opening up the wing. I still have some of his A123 packs in use 5-6 years later...
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Old 05-28-2019, 09:01 AM
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wrongwayfeldman
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Originally Posted by scootr View Post
I went to life batteries about 5 years ago. I used charged them every use without balancing for years without failure. Id say maybe 6 or 8 of these 1600 - 2200 and even a pair of 3200 in a bigger biplane.
Today I ordered a 2 wire balance buddy from Hangtimes Hobbies.
They said this inline charge modifier will balance cells - Worth a try. I know balanced cells is what we want.
I'm just saying I have 5 yr old Life batteries that have been balance charged maybe twice still quite even.
Wsheew...Thanx, I hoped I wasn't the only one . Haha. ...
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Old 05-28-2019, 11:26 AM
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Iíve been running Lifesource 2100 li-fe packs for years. I set them up to be removeable, so they are kept in a temperature controlled environment and so I donít have to drag an extension cord and charger out to the trailer.

Each season I run a discharge/balance charge and after many years one set of packs is down on capacity and takes a long time to balance.

Those batteries have apparently been discontinued, so I ordered a pair of Spectrum. Plugging those in to the charger showed one pack had a cell .2v lower than the rest. Putting them on a 1c balance, that pack never balanced. Switched the packs on the charge banks to make sure I didnít have a charger problem, ran discharge/1c balance charge, same problem.

Can someone recommend a high quality pack in the 2100 mah range, preferably with a deans ultra plug?
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Old 05-28-2019, 11:46 AM
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We've had customers use these for batteries tucked in the cowlings and out of reach: https://www.gravesrc.com/graves-rc-h...batteries.html

They've also had good luck with PowerEdge LiFe 2200's batteries.
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Old 05-28-2019, 12:14 PM
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Thanks, but Link gives an error message?
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Old 05-28-2019, 12:29 PM
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Website is back up
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Old 06-01-2019, 06:02 PM
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I use the Hobbico brand without trouble in my planes and transmitters..

https://vortexhobbies.com/hobbico-li...br2luupas58b43
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Old 06-01-2019, 06:08 PM
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Quote:
Originally Posted by scootr View Post
I use the Hobbico brand without trouble in my planes and transmitters..

https://vortexhobbies.com/hobbico-li...br2luupas58b43
Love thoes..had probably a dozen over last 9 years...never an issue...
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Old 06-01-2019, 06:15 PM
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Quote:
Originally Posted by ponyboy082662 View Post
Love thoes..had probably a dozen over last 9 years...never an issue...
Good to hear it
I've had good luck with all makes of the LIFE batteries ... over the years
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Old 06-01-2019, 06:56 PM
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Quote:
Originally Posted by scootr View Post
I use the Hobbico brand without trouble in my planes and transmitters..

https://vortexhobbies.com/hobbico-li...br2luupas58b43
Those are the ones Tower was showing discontinued. Now they show it as not a valid stock number.

https://www.towerhobbies.com/cgi-bin...1P?&I=HCAM6437
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Old 06-04-2019, 11:21 PM
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Originally Posted by JeffinTD View Post
Those are the ones Tower was showing discontinued. Now they show it as not a valid stock number.

https://www.towerhobbies.com/cgi-bin...1P?&I=HCAM6437
A quick google search found many sizes and sources of Hobbico life battery like the one below

https://vortexhobbies.com/hobbico-li...o7c8blqjeib5n2
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Old 06-06-2019, 01:40 PM
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Does amyone know what the internal resistance is recommended for life batteries? Ive been counting flights and charging too see what the packs take but after researching for a charger i found out about IR problem is I cant find what the recommendations are.
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Old 06-06-2019, 02:52 PM
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Quote:
Originally Posted by LIpilot View Post
I switched to A123 batteries 7 years ago and never looked back. I always balance charge them as it takes no more than 10 minutes anyway, sometimes on my way to the field. I use Life batteries too for smaller planes or ignition but I prefer A123's for the cell quality.

I use the Hitec chargers and balance charge all the time at 1c (2.5 amps for 2500 batteries), but it's taking up to an hour to put in 1,000 milliamps. Starts off real fast, but then it spends about 30 minutes or so balancing out the last .2 amps between the two cells. Seems to be the problem for all my A123 batteries. Any chance it's the charger? What chargers are you using out there?


Thanks.
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Old 06-06-2019, 04:06 PM
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I have had that same issue with the poly style LiFe batteries but never with a real A123. In most cases, it seems that the balance is oh so close but the charger just won’t turn the battery loose to complete the charge cycle. Have you tried completely discharging the batteries while watching the individual cell voltage? That would tell you quite a bit about the individual cell condition. Then if that test looks good, do a normal balance charge again watching cell voltages. I’m thinking one cell has an issue but for all your batteries to act that way does seem unusual. How does the charger act with a new battery?
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Old 06-06-2019, 04:22 PM
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Quote:
Originally Posted by rcbobp View Post
I use the Hitec chargers and balance charge all the time at 1c (2.5 amps for 2500 batteries), but it's taking up to an hour to put in 1,000 milliamps. Starts off real fast, but then it spends about 30 minutes or so balancing out the last .2 amps between the two cells. Seems to be the problem for all my A123 batteries. Any chance it's the charger? What chargers are you using out there?


Thanks.
I have a Hitec charger that reads the same way. I think it is just the way the last little bit goes in. I have another charger that does the same with the last little bit it just displays different. I run LiIon and LiPo and both chemistries do the same. I was told it is such a small amount at the end I did not have to worry about it. I only charge at one amp and was also told if I would up the charge input to a minimum of 1C it would charge at a rate that would not recognize that last little bit and end the charge. In my opinion if charging at a higher input warms the battery enough to not notice the last little bit it is to high for me. Of course none of this may be correct but charging at 1amp works for me, or at least my batteries last a long time.
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Last edited by acerc; 06-06-2019 at 08:35 PM.
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