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Vishnu P S Vas
04-11-2010, 01:12 PM
CAN ANYBODY SUGGEST A BATTERY THAT IS CAPABLE OF PROVIDING 17 V and maximum current 1.5A.
it has to be used in a small mobile robot to drive motors.so small size batteries

debu
04-11-2010, 02:46 PM
@Vishnu: Any particular reason why you are not considering a 12 volt battery with a simple boost regulator for making the 17 volts?

Regards,

Debu :)

MohitM
04-11-2010, 02:52 PM
Would 18V do? Three 6V lead-acid batteries in series maybe?

shobhitkukreti
04-11-2010, 04:27 PM
Would 18V do? Three 6V lead-acid batteries in series maybe?

with a diode i series to drop the voltage a little bit.

Vishnu P S Vas
04-11-2010, 04:44 PM
Three 6V lead-acid batteries in series.ok but can it provide 1.5 A

Vishnu P S Vas
04-11-2010, 04:47 PM
Three 6V lead-acid batteries in series.ok.
but can it provide 1.5 A .what may be its Ah rating

MohitM
04-11-2010, 07:03 PM
UPS batteries will.

pkshima
04-11-2010, 07:46 PM
how small is small when you say "small mobile robot" ? lead acid (SLA) batteries come in various shapes, sizes and AH rating.
Even the smallest may be too big for you. especially if we are talking about 3 in series. maybe use a single 6V 4.5 AH battery and step up the voltade using a DC-DC converter ?

17 V is quite a lot. Can you share some details on why you need 17 V ?

debu
04-11-2010, 08:05 PM
@Vishnu: I agree with pkshima, as I said before; you could buy a simple 12.6v 6000mAh Li-Ion battery, and use a LM2577 based boost regulator. Using the formula given here (clickie) (http://www.national.com/ds/LM/LM1577.pdf) on page 15, you could get 1.557A at 17V. Additionally your power supply would be very small and light, a fraction of the size of a single 6v lead acid battery.

Regards,

Debu :)