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Battery Question

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J

jhague

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I just purchased the hpi 1200 mah hump pack. I believe it's the one that comes with the savvy xl. What kind of run time have you guys gotten out of it? Was it worth 20 bucks with a wall charger? At this point anything has to be better than the stock 4 aa cell pack I would think. Let me know your opinions plz. :)
 
If your spending the $, go for a higher mah one. I have one 1100 (traxxas, came with revo), one 1400 mah with intelect cells and another 1500mah one I got off ebay for $22 shipped last season.

$20 doesn't seem to bad with a wall charger. But, you'd be better off saving up and getting a decent peak charger as it will help your packs live longer due to stopping charging when it's "full".
 
Yeap I think you did good with that battery. You will get a lot more run time, but the main improvement is that you'll see a HUGE difference in your servos, you will think that you replaced both your servos with stronger units. Your AA battery setup was putting out 4.8 volts. Your hump pack will be putting out 6 volts, and your servos will have the power that they were designed to be run on. It's like going from a 70 in/oz servo to a 100 in/oz servo just because of the power increase (those numbers are an example, as I don't know what servos you have or what their power rating is at 6 volts.) I had an 1100 mah receiver pack and I would use it for a whole bash session without it going dead. I would say that you should get at least 3-5 hours. But like Olds said, you should really consider getting a nice peak charger. I think the prophet chargers are perfect for this application because they have adjustable charge rates and can be used for receiver packs and also work great for stick packs if you have roto-start or if you get into electric RC's. I have one and use it a lot when I'm using my good charger on LiPo stuff.

http://cgi.ebay.com/Dynamite-Prophe...ryZ34061QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

and this
http://cgi.ebay.com/Tamiya-Style-Re...ryZ34061QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
 
The AA setup would put out 4.8 if your running rechargeable cells in it (1.2V per cell). If they are alkilines, it will still put out 6 volts (1.5V per cell). The issue is that alkaline cells don't allow for a lot of quick current draw like short fat 2/3A cells do. That's why you see your servos get stronger and possibly quicker. They get the power they need to perform at their peak.
 
olds97_lss said:
The AA setup would put out 4.8 if your running rechargeable cells in it (1.2V per cell). If they are alkilines, it will still put out 6 volts (1.5V per cell). The issue is that alkaline cells don't allow for a lot of quick current draw like short fat 2/3A cells do. That's why you see your servos get stronger and possibly quicker. They get the power they need to perform at their peak.
Click to expand...

Oh I didn't know that because I've never even thought about running alkalines because I always used rechargeables. Thanks for that information though, it's always good to learn stuff, I really don't like handing out bad information, except to Rolex.
 

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