HPX250: Safe to leave battery on charger when not in use for weeks?

[lonewolf2koc@hotmail.com]

When not using the HPX250 for weeks-months, should I leave the battery in the charger or not?
The purpose is to keep it from discharging w/ out over charging.

Coming from Anton Bauer batteries, they have a patented Live Saver Mode. I have to buy extra
chargers to keep the batteries charged and maintained at all times. It is working very well.
The batteries are always at the peak and always last long every shoot. However, I'm not sure if Panasonic has
similar technology on their battery & charger.

 

[Mac]

That's a very good question - I've always assumed that the Anton Bauer recommendation is the way to go (I also come from that brand, in fact still use them with an adapter on the 250). Anyway, I have 5 Panasonic batteries, three from my old HVX, and I've always left them on the charger when possible, and the two oldest HVX batteries still work well after nearly 5 years, although they do die much sooner.. But 5 years for Li-ion says something!

 

[guslar]

Thats what I find:

Panasonic Lithium Ion Battery Storage:

The batteries should be stored at room temperature, charged to about 30 to 50% of capacity. We recommend that the batteries be charged about once per year to prevent overdischarge.
PowerStream Note: Test data confirms that storage of lithium-ion batteries is best if the cell is partially discharged. In one test by Cadex Electronics ( http://www.buchmann.ca ) after 1 year storage at 25°C the non-recoverable capacity remaining is 96% when stored at 40% initial charge level, but only 80% if stored with 100% initial charge level. This effect is reduced at lower temperature and is a non-issue at 0°C. At higher temperatures the effect is much worse. Cadex's recommendations are to store below 15° C at 40% of full charge (3.5 volts per cell). Our experience is that with cells stored at room temperature for 3 years that the non-recoverable capacity did not decrease, so this is probably manufacturer dependent.