NewCheat sheets & tools
LiPo Voltage Cheat Sheet Sticker
Full, storage and land, per cell and per pack.

Details
Most LiPo datasheets give two temperature ranges: charge between 0 and 45 °C, discharge (fly) between −20 and 60 °C. This sticker puts both on one scale, with the range where you shouldn’t charge hatched in red. If your pack’s own label or datasheet says something different, follow the label.
It’s the pack’s temperature that counts, not the air’s. A pack that spent the night in a cold car has to warm up before it goes on the charger. In winter, carry your packs in a warm pocket, fly gently for the first minute and land a little earlier: a cold pack sags under load.
A black and white scale with the no-charge zones in red. Stick it on your charger, your LiPo bag or your field box.
Check the quality of my sticker article here.