Does Truecharge drain the battery when there is no AC power available?
The TC20, 40 and TC10hw (two bank) use isolation diodes for the two banks which results in drawing less than 1 micro amp drain from the battery. This is an insignificant drain on the battery – far less than the self-discharge rate of the battery. The TC10 one-bank portable model (clip-lead) draws up to 12 milliamps when no ac is present. This is comparable to the self-discharge rate of the battery. If the charger/battery is disconnected from any other charge source or load, the charger will typically drain the battery by 2 Ahr in 1 week. Therefore we recommend disconnecting the charger after a week if there is no ac power available for extended periods. Actually, given that it only has clips, we recommend disconnection as soon as the battery is charged. For permanent connection people should be using the TC10hw or TC10tb.
