Is it safe to get a universal/third-party charger from Amazon as a backup? I wont use it to fully charge the SP3 everyday. Just to keep one in the bag in case I need it. Maybe Ill use it once or twice a week just for 10-20% charge. The thing is, the original charge is so expensive for that use, yet it cant be used for other laptops in case I replaced the SP3 with something else that's not a SP4 (unlikely, though).
Do you use universal chargers?
(man I wish the SP3 could last just 2 hours longer)
Lots on ebay as low as $15. Just the risk not knowing what quality it is.