Charger works as advertised. As with any charger, it is important to remove any latent surface charge from the battery so that the charger can read the accurate voltage. I found this charger to read battery charge accurately. If you find it was say 70% while charging, disconnect and reconnect and it says 100% is surface charge. Turn on the headlamp for 30 seconds before plugging in the charger for the second time and the readings will be accurate.
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