The place where your two-way radio batteries are stored should be clear of anything combustible. If you detect it, you may need to clean any chemical that has seeped into or leaked out of your battery supply.
How does temperature affect a radio's battery life?
Temperature can have a major impact in your radio's battery life. You can lose as much as 25% operating time if your battery charges in a hot environment. Additionally, charging in extreme cold (-4 degrees F and below) can dramatically decrease total battery capacity. Almost all two-way batteries can be charged while not attached to the radio.
On newer models, like the IMPRES batteries supporting Motorola's XPR 7000e Series, a fully charged battery can last an entire day. That means fewer trips to the gang charger for a replacement. As good as they are, though, radio batteries have a shelf life of about two to three years, and poor battery maintenance can shorten that lifespan.
Keeping radios under their jackets and next to their bodies keeps them warm, but those batteries are still below room temperature. Recharging your radio batteries before they're above 4 degrees Celsius or below 60 degrees can reduce their useful life.
What temperature should a radio & battery be stored in?
Ideally, your radios and batteries should be stored at 20 to30 degrees Celsius, and humidity should be kept below 50%. That means your outdoor shed or portable, remote office may not be the best place for long-term storage. If you have an equipment storage room that meets these conditions, use that, instead.
In addition to storing your radio batteries in the right environment, be sure to store them at the right charge level. New batteries can be stored as you receive them, but if the battery has been used, it's best to charge (or discharge) it to around 50%. Doing that helps to maintain a battery's capacity and overall useful life.
Many radio batteries can be analyzed and reconditioned to give their total remaining capacity a bump. This is usually only beneficial for users who follow the above charging practices. If your radio will not turn on or the battery doesn't register on the charger, you should expect to replace it with a new one.