Hi All,
 I use a "Hyperion EOS 1210i" and "LBA10 net" balancer for most of my charging needs and despite being a bit long on the tooth by today's standards they have served me well.

One thing which disappoints me though it the discharge option. You can discharge packs down to between 2.7 & 3.6 volt per cell. I usually store my packs at around 3.8v per cell and as I am still using packs 3 years old I guess this is not doing them any harm.

Currently I discharge them down to the 3.6v then recharge them back up to my preferred storage voltage before final balancing.

Is there an "off the shelf" item I could buy with an adjustable voltage cut off I could set to 3.8v per cell? I'm not expecting to find something which works at cell level, just something I can connect in series with the pack which I can then set to the appropriate overall pack voltage (So 11.4 for a 3 cell pack, 15.2 for a 4 cell pack etc). I know the charger will detect a pack voltage error and sound the alarm when the battery connection goes open circuit but I don't mind that. All I want is something which I can use and then afterwards plug the pack into the balancer for final preparation for storage.

Thanks in advance

TTFN
John.

Ps I'm off on holiday for 2 weeks tomorrow so if I don't reply it's not because I'm ignoring you. 

Hi Igor,
 Thanks for the reply.

My EOS1210i will also do that and I use the facility after every flying session. The situation which bought about this post though was because I had around 6 fully charged packs I wanted to return to storage. (I hoped to get a cheeky session in before going on holiday so charged some packs in anticipation but the wind over here had other ideas). So I found myself with 6 fully charged packs and no likelihood of flying for at least 3 weeks. I don't like leaving packs fully charged for that length of time so I have been returning them to storage voltage and was finding it a laborious process.

TTFN
John.

Hi Dennis,
 Now that is a brilliant idea. So obvious when you think about it, I racked my brains for ages trying to think of a workable solution and you have already done it. I have enough CC Phoenix esc's spare at any one time to set up a rig just like you suggest. OK, that's my 1st job when I get back from my hols. 

Thanks again.

TTFN
John.

Bill,  As Igor said storage mode for Li-Poly batteries is at about 50% of capacity which translates to 3.8 volts per cell. Some chargers will have a "storage" mode that will drain the battery down to 50% and stop others do not. Some have a "storage" mode that will charge a battery up to 50% and stop but will not drain a charged battery down to 50% (at least some CellPro chargers for instance).

For long term storage you need to get your batteries into the 50% range or the battery life will suffer. Some folks will leave their batteries charged for several weeks (or longer) but I do not like to have mine out of storage mode for more than a few days (I have already spent too much on batteries ).