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04-06-2009 03:02 AM  9 years agoPost 1
heli24

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Honea Path, South Carolina

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i just bought a new jr sport (jsp91020) 2700 mah 4.8v nimh battery for my heli, it looks like it has c size cells in it, and there are 4 of them, my question is will my jr wall charger charge this and is it safe?? my wall charger says it can charge aa type and r6. it says any others can blow up, so if someone can answer that for me, that would be great, if its safe it says it will take 18 hours, thats 150mah charge rate divided by 2700 mah, does that sound correct?
thanks

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04-06-2009 03:24 AM  9 years agoPost 2
TaleGunner

rrElite Veteran

Deer Park WA

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It should but watch it the first time. Its awfull hard to blow somthing up at 150Mah. I think that pack has sub Cs if you get a better charger and charge at 2.7amps (2700Mah) it will recharge in 1hr or less.

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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04-06-2009 03:28 AM  9 years agoPost 3
heli24

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Honea Path, South Carolina

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battery question
thanks i appreciate youre response

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04-06-2009 03:28 AM  9 years agoPost 4
Spitfire1

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Perth Australia

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you can certainly charge it faster than 18 hrs.

I charge my the 1500 mah NIMH in my transmiter at 1 amp and never had any issues, probly takes about an hour, I know the 10 % rule is for lipos but it seems to work OK for Nimh, I think I usualy charge a bit less too be safe, so say 2000 mah at 1 amp just for eg.

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04-06-2009 07:50 AM  9 years agoPost 5
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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being a new JR pack, be sure to break it in, this is REALLY important.

plug it into the wall charger, and take it off after a day or two, or until the pack is warm.

discharge the pack to about 0.9V/cell. squeeze as much as you can out of it.

repeat the wall charger step. it is best to not use a higher end charger initially because it will likely false peak. you can use something like a Triton to get the bulk of the power into the pack. but then toss it on the wall charger for the night.

at 150ma, your not likely going to do anything except make the pack warm when i cant take anymore power.

repeat the charge/discharge cycle 3-4 times. then repeat it every so often depending on how much you use it.

not long ago, i baught a JR 2500mah Ni-mh pack for my DX7. the pack would initially only take in about 700mah out of the rated 2500mah. i was actually going to return it. but after 4 more cycles, it was finally taking in, and exceeding the 2500mah capacity.

Shawn
Team Leisure-Tech
Team HelixRC

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