BY JONATHAN MELBY
Like most portable electronics, some automotive navigation systems have built-in rechargeable batteries (usually nickel-metal hydride (NiMH) or lithium-ion (Li-Ion)). Batteries that are well cared for will have a longer productive life span and need to be replaced less frequently.
In researching for this article, I looked for sources that appeared to understand battery chemistry and test their hypotheses. Here are some key findings from my research:
Avoid High Temperatures
Tests show that keeping a battery at 115°F will reduce the cycle life by up to 60%. Higher temperatures do even more damage.
"Shallow" Discharge / Recharge Cycles are Best
Tests show that lithium-ion batteries that are only depleted by about 25 to 30 percent before recharging can be expected to take 5 to 6 times as many charge cycles as a battery that's always discharged to maximum design specifications.
Store Batteries in a Partly Charged State
I didn't find any specific test results for this claim, but otherwise reputable sources suggest that rechargeable batteries should *not* be stored in a fully charged condition. Nor should they be allowed to discharge beyond their design specifications.
Most sources suggested storing batteries with a 40% to 50% charge.
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