https://www.ebay.com/sch/i.html?_nkw=3M+Economy+Battery+6+60+X+8+80&_sacat=0&_dmd=2

3M Economy Battery, 6.60 X 8.80

Regular price
$200.00
Sale price
$136.00

Economy Battery, For Use With Mfr. No. TR-300 PAPR, Material Lithium