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› Charging Two Packs In Series
03-23-2009 04:43 AM  8 years agoPost 1
Henry

rrVeteran

Maryland

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Getting back into the hobby and will be working things a bit differently then before. Is there any reason why I cannot or should not charge two 2100mAh, 3 cell packs at the same time via a serial harness? The charger is the Astroflite 109 which can handle 8 or 9 cells at once and has adjustable output so I am guessing this will work. What about a recommended charging rate? I am thinking about 100-200mAh. I like to charge low and slow. Also, will be using Blinkies on both batteries while charging...

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03-23-2009 07:49 AM  8 years agoPost 2
Rob_T

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The usual advice is to only charge batteries in series if they were discharged in series. (This means the batteries will be approximately in balance with each other).

In theory your Blinky can discharge just over 300ma, so in theory it is impossible to overcharge any cell if the charge current is 300ma or less, so in theory it should be safe to charge any pair of batteries at less than 300ma - even if they weren't discharged by the same amount. Of course you need to have absolute faith that your Blinky is working correctly, that the balance connectors are wired correctly and that you'll never forget to use the Blinky. For my personal level of risk tolerance - that's not a set of risks I'm prepared to take (although as I said, it works in theory).

By the way, another standard piece of advice is to never charge lipos unattended. If you really are charging at the low rates you typed, the really long charge times will make it difficult for a single person to monitor the full charge. At 100ma, your battery will take 21 hours to charge if completely emptied.

Edit: By the way I assume you will use a single Blinky correctly connected to the 2 batteries. Don't even think of trying this with different Blinkys for each battery.

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03-23-2009 08:13 AM  8 years agoPost 3
Henry

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Maryland

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The batteries will be discharged in series together. Yes, I was going to use two separate Blinkies...I may get a different charger that will ballance at the same time. I never really liked the Blinkies anyway but they do work. Why not use two separate Blinkies?

In theory, I am not a purist but I do want things to work safely! The charge rate I mentioned is an old habit for individual 2400mAh batteries. Certainly I will up the rate for this application. What do you suggest?

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03-23-2009 07:43 PM  8 years agoPost 4
Rob_T

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Why not use two separate Blinkies?
Because they don't communicate with each other, so you can get a situation where battery A is perfectly balanced and full while battery B is perfectly balanced but still charging. In this situation, battery A risks being overcharged.

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03-23-2009 09:19 PM  8 years agoPost 5
Foster

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Saline MI

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Ditch the blinkies altoghter and get a proper charger with a balancer built in. At least thats what I would do... but I have no exp with the Astro charger.

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03-23-2009 09:29 PM  8 years agoPost 6
TJinGuy

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Socorro, NM - USA

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+1

In this hobby there is no reason to skimp on the important bits and your charger is one of the important bits.

- Chris

Team New Mexico
TJinTech

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03-23-2009 11:33 PM  8 years agoPost 7
Henry

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Maryland

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Great advice, guys and I appreciate you taking the time. Can you recommend a charger that, from your experience will handle my requirements? I do not want to skimp and would like to make the proper purchase first time out... for obvious reasons. Clearly, based on your input, the Astroflite 109 will not be the right choice this time unless I buy two of them like I did before.

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03-24-2009 12:04 AM  8 years agoPost 8
Rob_T

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I haven't bought a new charger for a while (my Schulze and Triton still meet my needs), but if I were thinking of buying a new lipo charger, the FMA CellPro would be near the top of my list.

By the way, IMHO there is nothing wrong with the Astro Blinky - it may not be this years shiny new toy but they dont stop working just because there are shinier newer toys out now. (But I was never a fan of the AF109, although I know of plenty of people who do like it).

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03-24-2009 12:46 AM  8 years agoPost 9
Foster

rrApprentice

Saline MI

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Any digital charger that'll do at least 6s if not higher but the thing to watch is the max charge wattage. Don't buy a 6s charger that's only rated for 50w because you won't be able to charge larger batteries at 1c. I buy chargers from HK for cheap and pay the price when they break Now though I need better chargers and I think I will buy from my LHS for the warranty.

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03-24-2009 01:50 AM  8 years agoPost 10
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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I use a TP-1010 charger with a TP-210 balancer which will handle any series up to 10S. It's pricey but a very reliable charger. The two units communicate to control the charge and balance as a team.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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03-24-2009 02:36 AM  8 years agoPost 11
TJinGuy

rrProfessor

Socorro, NM - USA

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So you need a charger that has a built-in balancer and can charge a pair of 3s packs at once. There are only a few that meet those requirements. The ones that come to mind are the Hyperion Duo and Cellpro 10s. Both are very nice and both require a separate power supply. Both have high wattage outputs and both are more than you need in terms of features and capability but both are worth every penny.

Take a look and see if either of those will meet your needs. Your other option is to pick up a pair of smaller chargers. Nothing wrong with that and maybe that might even work better.

- Chris

Team New Mexico
TJinTech

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03-24-2009 11:41 PM  8 years agoPost 12
altima1779

rrKey Veteran

Toledo, oh u.s

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I am using the Hyperion duo and love it. When i bought it i never thought i would need a charger that will do more than 6s but i found out quickly i was wrong. My solution for that was running two 4s packs in series.

With Hyperion you can charge two packs at once, each channel can handle 180 watts for a total of 360 watts. Another nice feature is the fact that you can actually charge in what they call sync mode which will balance the two packs as one.

From day one in this hobby i always resisted buying the higher end products. I have learned in the past three years this is not always good logic, so i follow a simple rule, buy the best that you can afford and buy once.

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