Lipo for th9x

[srivatsa]

Hi folks,

Can someone share opinion on using lipo on th9x transmitters ( turnigy and fly sky)?

I goth one lipo from leaders hobby for  fly sky th9x, forgot to remove the lipo from tx. after 2 weeks battery puffed waiting to explode. Luckily i noticed it on time and disposed it in time. No harm done to tx. Waiting to buy another lipo, any suggestions also welcome.

Thanks
Srivatsa

[girishsarwal]

If you're planning to buy a LiPo, you might want to consider buying a LiFePo4 instead. LiFePo4 is considered a safer chemistry and has lesser chances of going up in flames (may smoke though) if mishandled. The per cell volts on a LiFePo4 is 3.3 v so a 3s amounts to 9.9 v against a 11.1 for a LiPo. With 9.9 v the radio tends to heat up lesser as against 11.1 v when in use. The only problem is charging a LiFePo4 with a balanced LiPo charger can caue the battery to swell (obvious voltage diff), so buy it only if you've a compatible charger.. thehobbyshop.in sells one and it works well (although mine is a little swell because I made the same mistake, but realized early).

[amit_delhi]

Are we supposed to remove lipo battery from Tx after flying session? This does not make sense.

Did you forgot to turn the Tx off?

[srivatsa]

Hi amit,
I had triple checked   tx was off.
Even my understanding was if tx is off battery is safe.
 But guess it discharges even if you turn off  perhaps a small amount across the voltage regulator or the resistor inside.

so, i think it'd not safe to Leave it inside for long.

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[srivatsa]

Girishsarwal, thanks for that info.. i just checked, my charger has option for LiFe . Just ordered one from hobbyking  :-)

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[srivatsa]

Btw, what is the low voltage cut off for life batteries?

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[Mjet]

Hi Srivatsa,

You can use Low self discharge NiMH instead of Lippo/ Life. It will gives you 9.6 V and safe for Tx. I am using the same ( Eveready Ultima 2100 mah Low self discharge  ) on my Fly Sky Th 9X with out any issue.

Mohan

[srivatsa]

Mohan, i have Sony cycle energy 2500 mah nimh batteries, but the problem is charging time,  takes too long to charge all 8 batteries

[girishsarwal]

I've tried Duracell normal, Duracell rechargeable, Sanyo NiMH, Eveready, even Nippo but I do like the LiFe, why because they stay at their optimum performace range (3.0 - 3.3 v) for quite long and charge quickly, No need for the 14 hour charge at c/10.

The low voltage cutoff is considered to be 2.8 v but mine goes back to the charger at 3.0 v, and well, no memory effect. the only thing I hate about it is the charge leads are short, the stock connector on the THS battery does not fit easily on the 9x; you can use the 3 pin servo like connector, that fits well on the battery header. And the wires are a little too short for in-situ charging.

[srivatsa]

I'm planning to cut off the lead wires from my old battery (the one which is puffed).