Specifications

packs vary, see below:
EREVO BATTERY COMPARTMENT MEASUREMENTS
A123 cells have a very high energy density like Lipo cells, but are inherently safer and 99%
indestructible, so do not have to be used with an LVC (low voltage cut-off) device, and can be
charged much quicker given the correct equipment is used. Their resting voltage is 3.4v, which
makes a 5s configuration ideal for most applications that would normally use 12~14 Nimh cells,
or 4s lipo. The downside is that they are limited to 2300mah or so of capacity, so ideally should
be ran in a parallel formation such as 5s2p (2 five cell packs connected in parallel to double the
Mah capacity but maintain the same voltage as 5 cells). They can be purchased easlily by buying
a Dewalt 36v battery pack on Ebay, and then following one of the online tutorials which
demonstrate how to turn them into RC packs. Mounting them in the E-revo requires some fairly
drastic dremel work however.
A new generation of prismatic LifePo4 (A123 chemistry) cells are currently hitting the market.
These offer all the benefits of lipo cells in terms of power density and weight/size, but also have
the benefit of safer chemistry, faster charge rates, no LVC required and capable of very hig
current output without puffing or swelling. Currently there are only a handful of vendors for these
new batteries; MaxAmps, Hobby King, and Protek being then main notable sources, though given
the extortionate mark-up that MaxAmps charges (to pay for all its advertising and sponsorships
no-doubt) I would stay clear of them until their prices drop inline with the competition... if they
drop that is. There are other similar cells on the market, but most are low discharge, high
capacity packs, unsuitable for R/C use. Time will tell on this type of battery, but if other
companies start making and selling them for the R/C market, things will be alot brighter.