Sony:
BP-QM71 , CB-71QD , NP-QM70 , NP-QM71 , NP-QM71D , NP-QM90 , NP-QM91 , VSN024 , VSN024l88D , VSN024S , VSN024U , VSN025l31S , VSN025l99D , VSN025l99S , VSN046U ,
Do not short-circuit the sony battery.Accidental short-circuiting can occur when a metaillic object such as a coin,clip,or pen causes direct connection of the positive(+) and negative(-) terminals of the np-qm71 battery.(These look like metal strips on the sony np-qm71).This might happen,for example,wehn you carry a spare camcorder battery in your pocket or purse.Short-circuiting the terminals may damage the battery or the connecing object.
Keep the sony np-qm71 battery contacts clean: Clean your battery's metal contacts every couple of months with a cloth moistened with rubbing alcohol. This keeps the transfer of power from your NPQM71 battery pack more efficient.
If a replacement np-qm71 battery is being used for the first time or if the sony np-qm71 battery has not been used for a prolonged period.it may be necessary to connect the sony np-qm71 battery charger and then disconnect and reconnect it to start the charging.