Because Owning And Flying Your Beechcraft Can Be Done Safely AND For Less Money!
  My Favorite Battery Charger/Maintainer/Power Supply


Here's a great 20 Amp battery charger/maintainer that can be left on indefinitely. It's internal circuitry monitors charging voltage and maintains a safe voltage.



IMHO, the Guest Marine Model 2620 is an excellent 24v choice for maintaining your batteries. It will not boil or overcharge your battery and has a 20 amp capacity (10 amps per battery).


I had been using my Model 2620 for nearly 6 years before it died. I was so impressed with this unit that I replaced it with their Model 2620A. As of April 2013, I have about 8 years behind these Guest Marine units keeping my Concorde batteries in top maintained shape. By the way, my Concorde batteries are still going strong!


UPDATE: 12/2013 - My CB25XC batteries have been retired after almost 9 years of service. Their positive terminals swelled and I felt that was a sign that they had given all they could give.


When the new Part 23 rules (signed into law by Congress and the President) are enacted by the FAA some may choose to use the ETX30L AGM technology battery option @ $99 w/Free Shipping from Battery Mart with great 26 Ah, 400 Cold Cranking Amps performance specs and a weight of about 21.5 pounds. Read about AGM basics HERE.


Dimensionally it will fit where a CB25 battery would go with some wood spacers to take up a little of the slack. ETX30L Dimensions: Length: 6.63" x Width: 5.19" x Height: 6.88"





Here's another AGM candidate that some may choose to use the MTX30L AGM technology battery option @ an incredible $85 w/Free Ground Shipping from Battery Mart with great 30 Ah, and a whopping 440 Cold Cranking Amps performance specs and a weight of about 24 pounds. Read about AGM basics HERE.



ETX30L Dimensions: Length: 6.65" x Width: 5.16" x Height: 6.89"





See the Guest 2620A powering my roughly 4 second gear swings below:







In my opinion, the Guest is a good modest priced choice for augmenting your battery during gear swings (because the amount of free play in the hand crank is very dependent on system voltage) or when at the avionics shop or in cold weather climates for that extra "edge" in cranking power!


Here is the latest model style available for $168 on 1/2/2014 at Hodges Marine:



Unit comes complete with pre-wired 6-foot AC cord and 2 6-foot DC outputs with ring terminals. Waterproof, fully-encapsulated electronics. Lifetime warranty against internal water damage.


  • Components are completely sealed in durable, corrosion-proof, waterproof thermal potting compound.
  • Full 3-stage charging for fast, full charging and maintenance.
  • Potted components are fully impact protected.
  • Shockproof and vibration-proof.
  • Built-in electronic overload protection, with automatic reset.
  • Reverse polarity and ignition protected.
  • LEDs indicate state of charge.
  • "Smart" technology can be left on without harmful effects to battery.
  • All models may be used for storage/maintenance.
  • Thermal protection for extreme ambient temperatures.
  • Models for 12, 24 or 36 volt systems.
  • For flooded or gel cell batteries
  • 2 year limited warranty


Download the Guest Marine Catalog HERE



Here is another option popular with 28 volt Beechcraft owners, the Samlex Charger/Power Supply/Maintainer Model SEC-2425UL which offers 25Amps. See the Technical Specs HERE




Samlex's "smart" battery chargers are designed to operate with lead acid and gel batteries. Smart chargers evaluate the state of the battery’s charge level, and apply the appropriate charging current. They will maintain and condition the battery to maximize battery life. Protective features prevent excessive heat buildup during charging. The Samlex unit is available from Amazon, Summit Racing and BatteryStuff e-tailers.


PS: They also make a monster 40 amp unit SEC-2440UL shown HERE.



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