Review on Battery Tester Ancel BT500 Bluetooth Battery Load Tester For All 12 Volts Solar Power Systems/RVs/Motorcycles/Boats/Cars/Trucks With Charging System/Cranking Test (Update Version Of BM300) by Charles Palma

Update: Having used it on several batteries I appreciate the accuracy of the unit. You may have a fully charged battery by measuring the voltage, but the charge level may be too low and this device will let you know. Back: Set up with my iPhone was very quick. You don't need to go into Bluetooth settings to select this tester. I tested seven batteries with this tester. New batteries tested as expected. The only exception was that I found my Mercedes' charging system was overcharging the new battery. My 7 year old Walmart marine battery, which had been low for a while, had a health status of 12%. The tester said to replace the battery. My Battery Tender charger stopped charging after an hour so was useless. However, I connected the battery to the NOCCO Smart charger. After four days of charging, the battery had 100% performance. I believe this battery tester is for car batteries that should not be over-discharged. However, a ship's battery can be deeply discharged and still recover. I've also found that connecting the battery indirectly via the boost connectors can decrease health by up to 20%, resulting in falsely low readings. Therefore, you need to connect this tester directly to the battery for an accurate test. Since both of my new cars use AGM batteries and are electronically heavy, testing my batteries annually should prevent electronic issues and error codes. These batteries need to be changed more frequently and before they become so depleted that they no longer start the car.