Is there a backup battery that needs replacing?
When my main battery runs down and the computer shuts down, it loses default WiFi connection, date/clock and and other connection settings. Is there a lithium backup battery that I can replace?
There isn't a separate PRAM battery in Unibody MacBook Pros, although the pre-Unibody generations (A1226 and A1260) had them.
MacBook Pro 15" Core 2 Duo Models A1226 and A1260 PRAM Battery Replacement
If your battery runs down and it's not plugged into the charger, you should expect to lose all that PRAM-specific information: Clock/calendar/time zone, default network settings, and possibly default display sync. It's worth considering that your battery may be pretty old (A1286 runs from 2008 to 2013), so you might want to think about replacing it - either with an Apple-branded version, or with a new OEM replacement from eBay/online resellers.
Remember that different generations of A1286 have different, incompatible batteries, and different replacement procedures. Apple still stocked replacements for the late 2008/early 2009 generation battery last year.
MacBook Pro 15" Unibody (Late 2008-Early 2009) Battery
MacBook Pro 15" Unibody Late 2008 and Early 2009 Battery Replacement
MacBook Pro 15" Unibody (Mid 2009-Mid 2010) Battery
2009年中期 MacBook Pro 15" 2.53 GHz 一体化机 更换电池
2010年中期MacBook Pro 15寸 Unibody 电池更换
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MacBook Pro 15" Unibody 2011 年 早期 电池更换
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