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Old August 20th, 2009, 15:45   #56
ShelledPants's Avatar
Join Date: Feb 2008
Location: Toronto, On
Originally Posted by Crunchmeister View Post
J battery won't fit the E90. The J battery is a 9.6V made with 2/3A mini cells and designed for the TM P90. Echo 1 have made a small adjustment to the internals of the battery compartment allowing the use of a side-by-side 9.6V mini battery, like the one that comes with it.

However, those aren't typically available. I would recommend going to and build yourself a custom 9.6v 1500 mAh pack using Elite cells. It will cost about the same as a cheapo battery back would, but it's made with the best cells on the market and quality wiring and workmanship.
My apologies, I was under the impression the Echo1 was a clone (body wise) of the TM.

Another solution would be to dabble with Li-Po batteries, a 7.4v is smaller than an 8.4mini and will have the same power as an 8.4v large.

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