The internal electric wiring of the motor is also not up to specs for the higher current, also resulting in more heat generation. The motor runs at a faster speed which generates more heat and its casing is not designed to dissipate all this extra heat. Going to a higher voltage is more dangerous and can easily destroy the motor. At some point the motor will simply not work anymore because the voltage is too low to overcome the internal friction of the motor. It will still work, but at a lower speed and with less force.

Going to a lower voltage is mostly not a problem for the motor in the sense that it can be damaged. Some will work with a wide variety of voltages, others will not tolerate more than ☐.5v. Every motor is designed to work with a specific optimal voltage in mind, but, within certain limits, will work with other voltages too. You are right when you say that motors have some tolerance in the voltage they work with. MTO Battery is not affiliated nor endorsed by Snap-On®.As Ken said, they are not the same motors. Its sensible to attempt to recondition your 18V drill battery before going for the expensive option of purchasing a replacement, if your drill battery pack. Snap-On® is a registered trademark of Snap-On Incorporated. With this service, you must send your battery to us to be repaired. Note: This is a rebuild service and not an attempt to sell a new or aftermarket battery pack. Orders containing lithium batteries will ship by ground only regardless of the shipping method chosen. Send your CTB4185 battery pack to us for repair today! We rebuild all types of Snap-On ® brand batteries including those used in diagnostic equipment. From gardening to cleaning and advanced DIY, enjoy cordless freedom outdoors, in. Our trained technicians work on Snap-On ® brand batteries each day and have been working with many Snap-On ® dealers for years. Accomplish tough jobs thanks to POWER FOR ALL: one battery for all 18V tools. Send your CTB4185 battery into us and let us make it work as good as new. Our NiMH battery will provide approximately 50% longer run times on each charge all while adequately powering your tool. NiMH High Capacity / High Performance: Select this option if you are a heavy user of your battery and want the best performance. This option handles higher amperage than the NiCad Standard Performance option. NiCad High Performance (OEM Equivalent): Select this option if you would like your battery performance to be similar to the performance that it was when you purchased it. This option will provide great run time but will not handle extremely high amperage. NiCad Standard Performance: Select this option if you are a casual user or you do not use your tools in the automotive field. Cases, connectors, and circuit boards are re-used and are not replaced or serviced. For the cost of this service, we will open the battery pack, replace all cells, test, and reassemble. Rebuild Service for a Snap-On ® CTB4185 battery pack. Battery Reconditioner For SEGWAY® Lithium Batteries.The M18 REDLITHIUM XC Extended Capacity Battery is designed with superior pack. SEGWAY® Lithium Rev.AH and Rev.AJ Issues Delivers more runtime, power and speed than standard lithium-ion batteries.Lithium Battery Shipping Changes For Air Shipments.

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