I just ordered a Lifeline AGM (absorbed glass mat) battery model GPL-U1T from Defender.
12 volts, 33 amp hours, 275 cranking amps, 7.71" L x 5.18" W x 6.89" H.
I'm using it to run my Graupner Duo 30 out at the field. It's a little on the heavy side but I won't need to move it alot because I like all my equipment to be portable. I will just use it at the field table. I haven't done a field box yet but one thing it won't have is a power panel and a battery. That will lighten the box significantly.
Battery was $98 shipped.
You can lay these batteries on there side with no ill effects.
This setup... Graupner field charger, AGM battery, allows me to use the Graupner lead acid program trickle charge with adjustable milliamp hooked to a 12v power supply, to charge this field battery at home or off my truck if ever neccessary. It's got a full program for charging lead acid car batteries including automatically going into a programmable trickle level. The Graupner manual states "automatically reduces the final charge voltage to 2.2 to 2.3v per cell which effectively prevents excessive gassing of the battery even if it is left on charge for a fairly long time."
"This program is designed for charging and discharging lead-sulphuric acid and lead-gel batteries"
The Graupner allows me to control maximium permissable charge current. "The charger constantly monitors the battery's voltage, thereby limits the current in order to prevent excessive gassing of the battery."
"Caution: Lead Acid batteries cannot and must not be fast charged"
"Lifeline AGM (absorbed glass mat) batteries, originally developed for Military Aircraft, are the premium sealed, maintenance free deep cycle battery available. Hand made with a sturdy non marking case, they are widely used as original equipment by such companies as; Hinckley Company,Alden Yachts, Cabo Yachts, Island Packet Yachts, Sabre Corporation and others. Lifeline AGM batteries are more shock tolerant and have the fastest recharge rates due to their low resistance and aircraft class construction and no current limitations with voltage regulated charging.They offer the best charge retention as well as twice as many discharge cycles as the leading gel battery. Other features include; lowest discharge rates, the ability to fully recharge after 30 days of full discharge, non spillable user safe construction and a one year unconditional, 60 month prorated warranty thereafter making Lifeline AGM batteries the highest quality AGM option on the market."
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