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Is it possible to charge dual parallel IMR batteries?
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#1 (permalink)      1/13/2015 2:25:28 PM US Central   quote/reply + tips
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Is it possible to charge dual parallel IMR batteries?
I am planning to build a mod. Since it's dual parallel IMRs, I would like to know if it is possible to use one single chip to charge the batteries. Well I know it's possible, but is it SAFE? Both batteries will receive the same amount of energy?
#2 (permalink)      1/13/2015 2:37:09 PM US Central   quote/reply + tips
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Yes it's perfectly fine to charge multiple parallel connected batteries. If you charge and discharge the batteries as a pair then yes, they receive and dispense energy in equal amounts. What you don't want to do is mix different batteries whether that'd be due to make, capacity, charge, age etc.
V = dU/dq | I = dq/dt | P = dU/dt = V·I | V = I·R
#3 (permalink)      1/13/2015 2:42:15 PM US Central   quote/reply + tips
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To have it properly you'll need something like below:

YiHi 9V Balancing Charger Board:

- Balance charging supports dual battery 4.2v and has charging output of 450mA per cell.
- 2 LEDs indicate status of each battery separately.
- During charge cycle each LED will be red and turn off separately as each battery completes its charge.
- Requires a 9V wall adapter with 3.5mm barrel connector.

If you don't want to invest in something similar, you should imo simply use an external battery charger instead.
#4 (permalink)      1/13/2015 3:16:13 PM US Central   quote/reply + tips
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what the actual fuck is 'dual parallel' anyway?

there's only parallel and series

'dual parallel' makes no sense

not attacking you, i've seen loads of people saying it... but it doesn't exist.

cells in parallel are just cells in parallel. no need to specify that it's multiple cells because being in parallel already states that
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#5 (permalink)      1/13/2015 4:29:09 PM US Central   quote/reply + tips
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Yes, this PCB charger is good to charge multiple batteries in parallel.

It is limited to 1000mA.
The more batteries you will put in parallel, the longer it will take to charge them completely.

Make sure that the batteries have the same voltage before connecting them together, or at least very close to the same voltage.
The higher the voltage difference, the greater the risks potential.
It is the equivalent of charging the battery with lowest voltage without any current limitation.

What SteveLy is partially right, mixed capacities in parallel is not really a problem.
I do not recommend doing that tho.
In series it would be problematic, but not in parallel.

Hiko9 wrote:

what the actual fuck is 'dual parallel' anyway?

there's only parallel and series

'dual parallel' makes no sense

Dual, as in 2 in batteries.

Parallel and series circuits are not limited to only 2 cells.
Never saw labels on li-ion pack like 1S2P, 1S3P, ..., 6S4P, etc... ?

#6 (permalink)      1/13/2015 7:01:41 PM US Central   quote/reply + tips
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+1 details
When batteries are in parallel they are considered one battery with cells.

The safest way to put them in your mod is to connect a resettable fuse between the cells. It also will protect from reverse battery and if you add a mosfet you can light a led if you reverse them and protect whatever chip your using if using a regulated chip. Look up Mamu raptor build she incorporates both fusing and mosfet w/lighting reverse warning led techniques in its build with an easy to do laid out schematic.
#7 (permalink)      2/8/2015 10:35:16 PM US Central   quote/reply + tips
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Should have no issues remember Parallel builds only amplify the man not the voltage so the 4.2V limit still applies! OASIS Got it right just saw yours response! Those Raptor builds are awesome!! thinking about starting one soon!! check out Mamu if your looking to build one they figured out how to add the voltmeter to read both input and output voltage with a 3 pin rocker switch! Giving me an itchy trigger finger on digikey right now Also for the Murata equivalent. For shits and giggles..
#8 (permalink)      4/25/2015 10:03:25 AM US Central   quote/reply + tips
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YiHi 9V Balancing Charger Board:

The Yihi board is intended for charging two cells in series configuration as far as I know.

Edited on 4/25/2015 at 10:03 AM. Reason:
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