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If you have a v.3 hand controller, it will tell you what voltage your battery is putting out,[ the v.4 has deleted this function, along with the ambient temperature function]. Voltage will tell you whether the battery is fully
charged, but only a load test will tell you how good the battery is.
The hand controller will function down to 7.5v, but the mount requires
11 to 15v. The red power light will start blinking when the power is approaching the minimum required voltage.
raymo
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