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Topic: R2D2 Project - Am I buying the right battery? (Read 650 times) previous topic - next topic

telarium

Going to start a project to mod the Hasbro Interactive R2D2 to be controlled either with an Arduino or a Raspberry Pi. The toy currently uses four "AA" batteries  for the logic board and four "D" cell batteries to drive the motors. I want to replace that with a single LiPo battery.

I'm new to powering projects with batteries, but I have been doing a lot of reading. Here is what I was planning on buying:

LiPo 7.4v 5500mAh with PCB protection circuit:
http://www.all-battery.com/74volt-5500mahli-polymerpackwithpcb.aspx

Switching BEC, configured with either 5v or 6v with a regulator:
http://www.ebay.com/itm/380588963849?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

Universal charger:
http://www.all-battery.com/universalsmartchargerforli-ionpolymerbatterypack37v-148v1-4cells.aspx

The toy itself:
http://www.amazon.com/Star-Interactive-Astromech-Droid-Robot/dp/product-description/B001E95SQ2/ref=dp_proddesc_0?ie=UTF8&n=165793011&s=toys-and-games

Does this seem like what I'd need? Is it underkill, overkill, or am I missing something? Any help would be greatly appreciated. Thanks!

Erdin

It looks a nice matching set to me.

I would prefer a single cell LiPo battery. If two cells in series are used, one cell could get charged more than the other, or one could get damaged.
This is almost never a problem, but I just happen to like using just one cell.

Chagrin

The charger looks a little weak. 500ma max and it doesn't appear to have any cell balancing features; just a straight 500ma charge?

This charger requires an external AC adapter (wall wart) but generally a much better charger.
http://www.hobbyking.com/hobbyking/store/__7028__Turnigy_Accucel_6_50W_6A_Balancer_Charger_w_accessories.html

Erdin

Chagrin is right.
You could use the battery packs used for RC.
With cell balancing it is no problem to have a few cells in series.
With a higher current to charge the cells, cell balancing is required.

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