Double and Quad-time NIMH Current Draw?

[nolasco]

Does anyone know how much current can be drawn from the double (~100mah) and quad-time (~200 mah) NIMH cells?

Jun Nolasco

[Kasra]

Hi Jun, I think I read somewhere that under load(i.e. the max anticipitated current) the voltage should drop to no less than 0.8 from the nominal 1.2. I will check and report unless others know already.

[jberg]

Hi,

I would not try to draw more than 1A from the GP120 (=Double Time) cells. It is even better to stay at about 0.85A, which is quite ok for the WES-Technik DC5-2.4 motor. Then you will get about 80mAh of real power before the cells go down to 0.9V.

I did not take measurements with the GP280 (=Quad-Time) cells yet, but would expect them to be ok at least up to 2A.

Regards, Jochen

[nolasco]

Thanks for the info.

But, I guess that kills my plan to use them on a quad N20 setup (2 geared drives w/ 2 N20s each) with 0.8A per motor.

This now brings up the question: which is the smallest cell (NiCd and/or NiMh) that can supply 3-4 amps of current?


Jun Nolasco

Originally posted by jberg:
Hi,

I would not try to draw more than 1A from the GP120 (=Double Time) cells. It is even better to stay at about 0.85A, which is quite ok for the WES-Technik DC5-2.4 motor. Then you will get about 80mAh of real power before the cells go down to 0.9V.

I did not take measurements with the GP280 (=Quad-Time) cells yet, but would expect them to be ok at least up to 2A.

Regards, Jochen

[jberg]

Hi,

the Sanyo Twicell 700mAh NiMH Micro cells (quite a lengthy name :-) seem to be a good starting point. They weigh 12g each and are ok for me for about 3A peak static current. Charging with 700mAh=1C works good. They supply a Speed 280 geared 4:1 with an APC 9x6 slow prop for about 15-20min of flight time. The model is made from 3mm Depron and has 300g all-up weight.