cell phone batteries specs for a moving robot, please

Actually, cell phone batteries are pretty high on the efficiency scale when you compute how much power they store per unit weight. The only drawback is that they tend to go flat when they sit around pretty quickly. But on the upside, they are fast chargers. So it really depends on how you intend to use your robot. I have used all kinds of batteries in robots, and mostly depend on lead acid gel cells because they are cheap and readily available. But I also let them charge all night, so that is a pain. But I also have used cell phone batteries in small robots with good effect. NiCads, on the other hand, have fine power density but take too long to charge in many cases. NiMh are perhaps the best overall for robots that see fairly continuous usage.

Cheers!

Chip Shults My robotics, space and CGI web page -

Most of the heavy duty type modern cell phone batteries run about 800 to

1100 ma/Hr, depending on the model type. The drawback you are going to find with these batteries is that they are awful expensive. I had to replace the battery in my Motorola V60c. The battery is the heavy duty one, and the cost was about $90.00 US for the original type. After about a year or so, they stop holding the charge with my phone. But, I am a heavy user, and have to charge it more than once or twice a day. I am on it most of the day for my work. Infact, I keep two batteries and rotate them. They are supposed to have a life span of about 500 to 800 charge cycles with a maximum life of about 3 years. I am doing more than 600 charge cycles per year. The phone gives about 1.5 to 2 hours talk time on a full charge. The battery however is very small and light. It is about 1/2 the size of a credit card, and is about 2/3 of the width. If you were to use two of them in parallel for a project, you would then have about 1600 to 2200 ma/Hr.

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Greetings,

Jerry Greenberg       GLG Technologies GLG
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"Pedro Duarte"  wrote in message
news:m3a7qv0sv66376cl278i2j4qdio5um7t2c@4ax.com...
Hi !

I would like to know were can I find some specs about cell phone
batteries, that is, how much voltage they supply, weight, etc

My goal is to use a light weighted battery on a small moving device (a
little robot, maybe "brained" by a PIC), so weight is important.

I thought on cell phone batteries but is there another good (and
cheap) alternative ?

Tnx