EarthX Lithium Batteries has a new 8 Ah backup battery for experimental aircraft! Designed and engineered specifically for avionics and critical electronic systems. Available now on www.earthxbatteries.com. This is a TCW IBBS upgraded replacement.



I wish the battery portion was replaceable much like the TCW instead of buying a whole new one when the battery life is up.
That is another sad fact that big companies buy these little companies and jack up the price. I have replaced mine and another friend's TCW battery just before they were bought out and the charge was $159, nearly have the cost.I would agree, but having just purchased a replacement 6a backup battery from TCW, the cost with shipping was $300 (vs $400 for the EarthX). Unfortunately, something is either wrong with the replacement TCW battery or the TCW unit has developed a problem and now I’m returning the replacement TCW battery and I ordered the EarthX. For the extra $100, I’ll be buying slightly more capacity.
I just had to replace my backup battery this past spring on my old fashioned "roll our own" backup system. Although the AH on my unit does not compete with the 8 AH of the EarthX, the replacement battery only cost $15.00. It comes with slide on crimped terminals so is an easy install. I can buy a huge number of replacement batteries at this price before I ever hit the price point of TCW or EarthX.We used to roll our own before the TCW became popular.
www.trcelectronics.com
Steve, are you using this as a back-up efis battery?I just had to replace my backup battery this past spring on my old fashioned "roll our own" backup system. Although the AH on my unit does not compete with the 8 AH of the EarthX, the replacement battery only cost $15.00. It comes with slide on crimped terminals so is an easy install. I can buy a huge number of replacement batteries at this price before I ever hit the price point of TCW or EarthX.
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PS-1220 F1
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The backup battery is only feeding the pilot EFIS and the AHRS. It truly is for emergency. That battery is rated for 2.5 AH. That gives me about 1 hour of use for those instruments. If I have an electrical failure that causes all instruments to go dark I flip a switch to power those two instruments and get on the ground as fast as possible. Keep in mind my plane is not equipped for IFR.Steve, are you using this as a back-up efis battery?
I also looked a couple of weeks ago and couldn't find it on their Web site.It seems all reference to this backup battery has disappeared from the EarthX site. I can't find anywhere to buy it. Is the product still in development?
Wonder if anyone saw them at Oshkosh and can confirm or deny that they were advertising it...I also looked a couple of weeks ago and couldn't find it on their Web site.
I did not see them at their booth. I will confess though I was not thinking about that battery at the time.Wonder if anyone saw them at Oshkosh and can confirm or deny that they were advertising it...