Radio Accessories > Radio Electronic Equipment > Battery Backers - Radio Bookmark this Page

EMS - EMOM0013 EMOEMO0013 EMO0013 812872000138 0812872000138
Manufacturer Stock#
A Closer Look at This Product
  Tech Notes

Browse EMS

EMS Ultimate Battery Backer JR/S/Z
EMS Ultimate Battery Backer JR/S/Z
View Larger Picture

Parts Saver Eligible:Yes

Stock Number
Retail Price
Tower's Low Price
FREE shipping when ordering this item on our web site... click for more information
Stock Status
In Stock
Limited Quantities

Buy Now
Add to wish list
—— Share ——

Tech Notes
This is the Ultimate Battery Backer from Electronic Model Systems.
This is a device which switches between main and auxiliary battery packs
depending on the voltage difference between them.


Works with 4 or 5 Cell NiCD packs.
Works with 6Volt Gel-Cell or Lead Acid batteries.
Universal connector works with Hitech, Futaba, and Z connectors.
Main and backup batteries must be the same number of cells and the
same voltage.
Capacity of the two packs is not required to be the same.
Simple wiring and installation
Optional remote backup indication
Optional inflight backup indication
60 Amp MOSFET devices used as battery switches.
MOSFET device ON resistance of 0.018 ohm or less for minimum voltage
Lightweight device


One Battery Backer with pre-installed conenctors
One Instruction sheet


Two receiver packs


Length: 39mm (1.54")
Width: 37mm (1.46")
Height: 19mm (0.75")
Weight (without conenctors): 0.6 oz
Voltage switch: When main pack falls 1.2 volts below auxiliary pack


If both packs fail, the backer will switch to whatever pack has
higher voltage.

cmc 12/31/01

– If you need more information, use these EMS resources –
Phone: 800-845-8978
  Postal Address:
22605E LA PALMA AVE. STE 516

Click here for Units of Measure Conversion Calculators

Tower Hobbies Has Been Serving Hobbyists Since 1971 • Call 800-637-6050 or 217-398-3636
See Tower Hobbies
Reviews at
Hobbico, Hobby & Model Construction
Supplies - Retail, Champaign, IL
We accept the following: We accept the following payment methods: Discover, MasterCard, Visa, American Express, Diners Club International, JCB, China UnionPay, PayPal, and PayPal Credit.
Unauthorized use of any materials presented here is prohibited. Copying or reproducing any elements from this page is not permitted. All prices, descriptions and availability subject to change. Displayed within some areas of our web site, the Retail Price is suggested by the manufacturer or supplier, or estimated in keeping with standard industry practice. It may not represent the prevailing price in your area or a price that Tower Hobbies has ever offered for the item.
Copyright © Tower Hobbies All rights reserved. Do not duplicate or redistribute in any form.