MTO Battery has proven to be an industry leader in aftermarket battery assemblies that are assembled in the USA. The Fluke 1289237 replacement battery is no exception to this rule. With a very conservative rating of 3800mAh this battery is a steal of a deal. Upon testing this assembly it is found that the battery capacity is actually over 4000mAh capacity which is phenomenal! The shrink wrapping and wiring harness on this Fluke 1289237 battery replacement is very professionally done and is of high quality. If you have Fluke 635 test equipment please go to https://www.mtobattery..com/products/fluke-1289237 to purchase this fine product.