I couldn't find William's post on the battery, but, IIRC, he warned that
lithium batteries have internal wiring to protect them, and a plane that
was using one had that circuitry shut the battery down, which killed the
ignition. There is no such circuitry in a lead-acid battery.
AGM [Absorbent Glass Mat] batteries are still lead-acid, but the
electrolyte is absorbed in a fiberglass mat instead of free liquid form.
They are lighter and smaller for the same power output than a regular
lead-acid battery, and they have excellent cranking power and don't
require venting. Disadvantage: they cost more. AGM batteries are an
advanced form of sealed lead acid batteries that provide superior
starting power.
Bob Nuckolls, of the AeroElectric Connection, has been an advocate for
them for years. He replaces his batteries in his airplane and puts his
older AGM batteries in his car, and they provide great starting power in
freezing weather. They also surprise gas station attendants who can't
believe how small they are.
AGM batteries are more expensive than regular sealed lead acid batteries.
On 7/2/2022 6:31 AM, Sid Wood wrote:
For my 2180 VW, I used Power-Sonic 18 amp-hour sealed lead-acid
battery. Can be mounted any position. Power Sonic PS-12180 NB 12V
18AH SLA is $57.99 from Amazon. I also used a Power Sonic PS-1270 F2
12V 7AH SLA Battery for ignition and avionics backup. PS-1270 is
$25.99 from Amazon. The power control panel provided automatic
transfer to backup battery and kept both batteries charged using the
VW alternator. I used a battery minder when parked in the hangar.
Sid Wood
Tri-gear KR-2 ex-N6242
California, MD, USA
*From:* Lulubelle Pitts via KRnet
*Sent:* Friday, July 01, 2022 11:06 PM
*To:* krnet@list.krnet.org
*Cc:* Lulubelle Pitts
*Subject:* KRnet> (no subject)
What kind of battery do you KR ers use with a VW engine - a motorcycle
battery?
Thanks. a new KR guy. 😀
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