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Old Jun 22, 2015, 07:37 PM
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Unseen before NiMh TX pack behavior

Bought a used 9C awhile back, had a HydriMax (hobbico) 8 cell 2000 mah pack in it. Was getting ready to charge it up, noticed the voltage at 8.4. Figured it was dying, I hooked it up to my Peak Sirius Pro charger, and it took about 1300 mah. I then discharged it with the Peak SmartTest, took out 1697 mah. Put it back on the charger, went to 1790 mah. Issue is, the voltage when fully (?) charged never went above 10.6 after either charge. My other NiMh batteries always went up to 11.2 or so after a charge, but quickly settled in at 10.6. Anybody seen this before? It's the first time I've ever had that brand of pack, so don't know if it's normal for HydriMax.
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Old Jun 22, 2015, 08:21 PM
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Replacing unknown batteries with new is cheap insurance and peace of mind well worth the few bucks it'll cost you IMHO.
Whenever I buy second hand planes or electronics the first thing to get replaced is the battery pack.You really don't know how old the cells are or how they were treated by the previous owner and they are the lifes blood of your control system.You can find new replacement nimh's pretty easily but when it came time to retire my tx packs in my current radios (T9CAP and T7C) I went lipo for about $15 USD each.
https://www.hobbyking.com/hobbyking/...dProduct=33272
Instead of having to make sure I was charged every week I now go weeks without having to recharge .
hope this helps
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Old Jun 22, 2015, 08:33 PM
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I was asking about the behavior, if it was peculiar to HydriMax battery packs. Thanks!
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Old Jun 22, 2015, 08:58 PM
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Warjet that pack has a voltage protection circuit in them. I had one in my helios b4.. never went about 10.8 .
also you put almost 1800mah in a 200mah pack tells you its good. well it tells me its good.
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Old Jun 22, 2015, 09:48 PM
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Originally Posted by MaxOverdrive View Post
Warjet that pack has a voltage protection circuit in them. I had one in my helios b4.. never went about 10.8 .
also you put almost 1800mah in a 200mah pack tells you its good. well it tells me its good.
That would explain the behavior. Thanks for the info!
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Old Jun 22, 2015, 09:54 PM
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I mostly use LiFe and Aloft's NiMh for the transmitters. Don't use LiPo's in the older 9.6 volt radios from Hitec, JR, and Futaba because all specifically say not to, puts too much stress on the voltage regulator.
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Old Jun 22, 2015, 10:12 PM
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Quote:
Originally Posted by Warjet1950 View Post
I was asking about the behavior, if it was peculiar to HydriMax battery packs. Thanks!
I guess my point was that if you have to ask about the condition of an old battery pack it's about time to retire it regardless of chemistry.
As far as I can tell by reading the specs at Tower and Hobbico the Hydrimax cells appear to be simple nimh cells.
As far as "protection circuits" go that might need a better look.Never seen one on any nixx tx pack before...see no mention of it on any Hydrimax product page and don't see the need since their nominal voltage is the same as any similar nixx cell.
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Old Jun 22, 2015, 11:20 PM
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Quote:
Originally Posted by imgumby View Post
I guess my point was that if you have to ask about the condition of an old battery pack it's about time to retire it regardless of chemistry.
As far as I can tell by reading the specs at Tower and Hobbico the Hydrimax cells appear to be simple nimh cells.
As far as "protection circuits" go that might need a better look.Never seen one on any nixx tx pack before...see no mention of it on any Hydrimax product page and don't see the need since their nominal voltage is the same as any similar nixx cell.
imgumby
Understood your point, wasn't asking if the battery was good, wanted to know why it would not go above 10.6 when charged to full capacity. I guess this thread has run it's course. Thanks for everyone's help!
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