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Updated: 06 Apr 2026

10 Best Power Tool Battery Converters Lithium-ion

#1 Best Pick
Adapter for Makita to for Milwaukee, for Makita 18V LXT Battery Convert to Work for Milwaukee 18V M18 Cordless Power Tool

Adapter for Makita to for Milwaukee, for Makita 18V LXT Battery Convert to Work for Milwaukee 18V M18 Cordless Power Tool

Brand: EID
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  • ✅ 【Adapter Fully Compatible for Makita 18V Battery】Battery converters are fully compatible with Makita 18V Battery BL1850 BL1840 BL1830 BL1820 BL1815 etc. Applicable models for Milwaukee 18V M18 power tools.
  • ✅ 【Compatible for Mliwaukee 18V/M18 Tools】Perfectly compatible with most Green Tools for Milwaukee 18V M18 Li-ion series, except for M18 M18B. Replacement for Milwaukee 18 V Lithium Ion Battery M18 M18B 48-11-1850 48-11-1852 48-11-1820 48-11-1860 48-11-1828 48-11-10 XC.
  • ✅ 【High quality materials】 Our battery adapters are made of durable, high quality ABS plastic and injection molded to resist scratches, moisture and corrosion, making them suitable for both indoor and outdoor use.
  • ✅ 【Easy installation】 Press the buttons on both sides of the converter and insert the corresponding lithium-ion battery into the bottom of the adapter and the corresponding brand tool to convert it. When the work is complete, disconnect the converter from the battery to avoid damaging the battery.
  • ✅ 【Warranty, Service】 30 days money back, 6 months warranty. If you have any problems, please do not hesitate to contact us. We will contact you within 24-hours with a completely satisfactory answer.
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#2 Best Value
Adapter for Ryobi to for Makita Cordless Tools,Convert for Ryobi 18V Battery P107 P108 P109 to Work for Makita 18V Cordless Power Tool

Adapter for Ryobi to for Makita Cordless Tools,Convert for Ryobi 18V Battery P107 P108 P109 to Work for Makita 18V Cordless Power Tool

Brand: DEWDYS
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  • 🛒【Use for Makita 18V cordless power tools】: This adapter can compatible with Ryobi 18V battery to make them apply for Makita 18V Cordless Tools,Replace for makita 18V LXT bateries: BL1860B, BL1860, BL1850, BL1845, BL1840, BL1830, BL1835, BL1825, BL1820, BL1815 LXT400,Converter top interface use for Makita 18V Cordless Power Tools. And let you Enjoy the benefits of extended run-time of Li-Ion Batteries on your existing 18V tools.
  • 🛒【Compatible with Ryobi 18V battery】:Adapter for Ryobi 18V Lithium Battery(P102 P103 P104 P105 P107 P108 P109 P190 P122 ect) and 18V Ni-Mh battery(P108, P192, P193, P194, P122 , PBP004, PBP005, PBP007 ect),Convert to for Makita 18V Battery.If for Makita Lithium-ion Battery stop working, use the adapter compatible for Ryobi 18V Lithium battery or Ni-Mh battery as power replacement.
  • 🛒【Safe & Reliable】Echoyee convert adapter built-in voltage protection chip, comply with FCC RoHS and CE security testing standards, made of high quality ABS plastic, safe and durable.
  • 🛒【Notice】Converter can't be used for power tool battery charging, this adapter will not fit into any chargers.If you need to charge the power tool battery, please use the original battery charger.
  • 🛒【Warranty & Service】30 Days Money Back, 6-Month Warranty and 24 Hours Customer Service. Contact us first if there is any question about the product.
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#3 Budget Pick
Battery Adapter Converter for Makita 18V LXT Lithium ion Battery to for Makita 12V Power Tools

Battery Adapter Converter for Makita 18V LXT Lithium ion Battery to for Makita 12V Power Tools

Brand: JJXNDO
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  • The upper interface is compatible with Makita 12V electrical tools. Attention please: The upper interface only works with 12V tools: DF031D, DF0331D, TD110D, JR103D, JR105D, HSS01D, HP332D, DC10SB
  • The lower interface is with Makita 18V LXT lithium-ion batteries such as BL1860B BL1860 BL1830 BL1860B BL1850B BL1850B BL1845 BL1850
  • Battery converter for Makita 18V Lithium battery conversion for Makita 12V CXT lithium-ion battery and work with 12V flat electrical tools
  • The battery adapter consists of high quality ABS plastic material, not 3D printed. The integrated electricity management system offers over-load protection, over-charge protection, over-charge protection, over-voltage protection and short-circuit protection
  • Package including: 1 x MT18MT12 battery adapter, battery is not included
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#4 Top Choice
Bosch 18V 2.5 Ah Li-ion Battery & Fast Charger Starter Set 18 V Power for All (DIY Green Home and Garden Tools)

Bosch 18V 2.5 Ah Li-ion Battery & Fast Charger Starter Set 18 V Power for All (DIY Green Home and Garden Tools)

Brand: Bosch
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  • POWER FOR ALL battery and charger suitable for all Bosch Home and Garden Tools within the 18 Volt System
  • No memory effect, no self discharge – always ready to use thanks to lithium ion technology
  • Particularly long life due to Bosch Electronic Cell Protection (ECP)
  • Not compatible with Power Tools from Bosch Professional
  • Items Included: 1 x 2.5Ah Battery, 1 x Fast Charger (AL 1830 CV)
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#5 Popular Choice
MT20RNL Battery Adapter for Makita 18V LithiumBattery to Ryobi 18V One+ Lithium-Ion Cordless Tool, Convert Makita 18VBattery BL1860B BL1850B BL1840 BL1830B BL1815 to Ryobi 18V BatteryP102 P108

MT20RNL Battery Adapter for Makita 18V LithiumBattery to Ryobi 18V One+ Lithium-Ion Cordless Tool, Convert Makita 18VBattery BL1860B BL1850B BL1840 BL1830B BL1815 to Ryobi 18V BatteryP102 P108

Brand: fohoa
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  • 【Adapter Converter Feature】: This battery adapter can compatible with Makita 18V Lithium li-ion slide battery to make them apply to RYOBI 18Volt cordless tools, with this converter can let you enjoy the benefits of extended lithium ion battery operation time on existing 18V tools instruments.
  • 【Applicable Battery Models】: The bottom of this adapter is only compatible with Makita 18V lithium Li-ion batteries, eg. BL1815 BL1815B BL1820 BL1820B BL1830 BL1830B BL1840 BL1840B BL1850 BL1850B BL1860 BL1860B BL1845 BL1890 BL1890B 18V Li-ion battery.
  • 【Replace 18V NI-CD/Ni-MH Battery】: Replacement for Ryobi P102, P103, P104, P105, P107, P108, P109, P145, P122, P161, P189, P190 Lithium-Ion battery and fit for Ryobi 18V ONE+ System Cordless Power Tools. (NOTE: Not fit for Ryobi cordless saw P551, for Ryobi 18v radio, lamp eg, for Ryobi P742 P746)
  • 【Durable and Convenient】: This Cordless Power Tools Adapter made of ABS material, strong and durable. Professional compact design and easy installation. Convenient to carry and easy to use. Size about 4.33x3.07x3.30inch.
  • 【Attention】: Can not be used for power tool battery charging, this adapter will not fit into any chargers. If you need to charge your power tool batteries, please use the original battery chargers.
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#6 Top Pick
Battery Adapter for Makita to Bosch 18V Lithium-Ion Cordless Tool, Convert Makita 18V LXT Lithium-Ion Battery BL1830 BL1840 BL1850 BL1860 to Bosch 18V Li-ion Battery Converter BAT609 BAT612 BAT618

Battery Adapter for Makita to Bosch 18V Lithium-Ion Cordless Tool, Convert Makita 18V LXT Lithium-Ion Battery BL1830 BL1840 BL1850 BL1860 to Bosch 18V Li-ion Battery Converter BAT609 BAT612 BAT618

Brand: QINIZX
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  • 【Adapter Converter Feature】: This 18V Battery Adapter only can compatible with Makita 18V Li-ion slide battery to make them apply to Bosch 18V Lithium-Ion cordless tools. Let you enjoy the benefits of extended lithium ion battery operation time on existing 18V tools instruments. Replacement for Bosch 18V Li-ion battery, eg. BAT609, BAT610, BAT611, BAT612, BAT618, BAT618G, BAT619, BAT619G, BAT620 etc.
  • 【Applicable Battery Models】: The bottom of this adapter is only compatible with Makita 18V Lithium Ion battery, eg. BL1860B BL1860 BL1850B BL1850 BL1840BL1830B BL1830 BL1820 BL1815 BL1415 BL1445 etc. .【NOTE】NOT Support charging Makita batteries with Bosch chargers (please use original charger).
  • 【NOT Suitable Models for Bosch】 Please be careful, this adapter NOT SUITABLE for Bosch 18V LITHIUM battery models: 2 607 336 039/2 607 335 040/2 607 336 207/2 607 336 208 / Power 4A II / for Bosch AHS 48 LI / for Bosch AHS 52 LI / for Bosch ART 26 LI / for Bosch PSB 18 LI-2 / for Bosch PSB 18 LI-2H / for Bosch PSM 18 LI / for Bosch PSR 18 LI-2 / for Bosch PSR 18 LI- 2H / for Bosch PST 18 LI / for Bosch UNEO MAXXH / for Bosch Uneo Maxx / for Bosch PST 18LI / for Bosch LAMP PML 18 LI;
  • 【Safe Protection】 There are short circuit protection, overcurrent protection, undervoltage protection and low power consumption. Tips: The Maximum initial battery voltage (measured with no workload) is 20 volts, the Nominal voltage is 18 volts; Please remove it from the battery when not in use, it is safe to use.
  • 【Durable and Convenient】: This cordless power tools adapter made of ABS + PC material, strong and durable. Professional compact design and easy installation. Convenient to carry and easy to use. Size about 110x70x50mm/4.33x2.75x1.97inch.
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#7 Top Pick
Battery Adapter for makita 18v to for OZITO for Einhell 18V Power Tools, converts for makita Battery Converter for OZITO&Einhell 18V Li-ion Power Tools

Battery Adapter for makita 18v to for OZITO for Einhell 18V Power Tools, converts for makita Battery Converter for OZITO&Einhell 18V Li-ion Power Tools

Brand: UNIKI
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  • Fully compatible:Battery adapter input power 18V,18V Li-Ion battery BL1815 BL1830 BL1840 BL1850 BL186 BL1850B BL1860B Fully compatible with BL1850B BL1860B etc.
  • High-quality materials:Our battery adapters are made of durable, high-quality ABS plastic and injection-molded to resist scratches, moisture and corrosion, making them suitable for both indoor and outdoor use.
  • Excellent product:Compatible with Makita 18V rechargeable batteries, this converter for Makita 18V lithium-ion batteries converts to OZITO& Einhell 18V cordless tools. Suitable for use with Einhell 18V drills, cordless drills, impact drills, cordless saws, cordless disk grinders, etc.
  • Easy installation:Press the buttons on both sides of the converter and insert the corresponding lithium-ion battery into the bottom of the adapter and the corresponding brand tool to convert it. After finishing the work, disconnect the converter from the battery to avoid damaging the battery.
  • Use with confidence:This battery adapter interface is perfectly matched to the battery. It is safe and stable during use. Don't worry about it falling off or coming loose. Note: This adapter cannot be used to charge the battery. To charge the battery, disconnect the adapter from the battery.
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#8 Top Pick
USB Charger Adapter, Power Source Charger Converter Lithium Ion Battery Adapter Power Tool Battery Converters with 3W LED Light for Charging

USB Charger Adapter, Power Source Charger Converter Lithium Ion Battery Adapter Power Tool Battery Converters with 3W LED Light for Charging

Brand: Shanrya
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  • [WITH LED LIGHT] With 3W LED light, switch reset button, 3 levels (100?200?300LM) adjustment, can illuminate a room of 10?.
  • [LITHIUM BATTERY] Use for power supply, so that power tool battery has multiple uses?????, with strong practicality.
  • [DUAL USB] The adapter has dual USB ports, 5V 2.1A output, providing fast and convenient charging.
  • [MULTIPLE USAGES] Suitable for situations such as car repair, workshop, construction site, walking, camping, fishing or home lighting.
  • [12VDC PORT] 12VDC port output, can provide 12V DC power, can be used for small heating and cooling appliances.
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#9 Top Pick
URUN for Ozito/Einhell 18V Battery Convert to for Makita LXT Battery Adapter, EIN18MT Adaptor Converter for Makita 18V Power Tools, Cordless Battery Converter for Einhell

URUN for Ozito/Einhell 18V Battery Convert to for Makita LXT Battery Adapter, EIN18MT Adaptor Converter for Makita 18V Power Tools, Cordless Battery Converter for Einhell

Brand: URUN
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  • 🌟 Multi-Use: Battery Adapter Convert Replace for Einhell/Ozito 18V Li-Ion Battery for Makita 18V batteries, which means you can use your einhell PXC 18V batteries work for Makita 18V Li-Ion power tools.
  • 🌟 Compatible with Einhell/Ozito PXC 18V Li-ion Battery: The EIN18MT adapter compatible with Einhell/Ozito 18V lithium battery. Use einhell18v battery to replace for makita 18V lithium battery. (Adapter only, No battery included)
  • 🌟 Easy to Use: The EIN18MT adaptor is very easy to use. Just need 2 steps: 1. Inser our EIN18MT adapter into the base of makita 18V power tools; 2. Insert Einhell/Ozito 18V li-ion battery into the base of our EIN18MT adapter converter. And then you can use the 18v makita power tools as normal.
  • 🌟 Nice and Tight: This Power Tools Adaptor was made of strong plastic. durable and safe, easy to handle.Replace for makita Lithium battery work for makita 18V tools, Good alternative to buying extra batteries.
  • 🌟 Warranty: If you are not 100% satisfied with your Handy Gadget EIN18MT, just return it within 180 days and we will full refund unconditionally, click add-to-cart now! (No battery included)
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#10 Top Pick
JANRI MT20RNL Battery Adapterfor Makit LXT Battery to Ryobi power Tool Use, Convert Makit 18V Battery to Ryobi 18V Lithium-ion Battery

JANRI MT20RNL Battery Adapterfor Makit LXT Battery to Ryobi power Tool Use, Convert Makit 18V Battery to Ryobi 18V Lithium-ion Battery

Brand: JANRI
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  • Advantage:This adapter enables the listed lithium batteries to be used on RYOBI 18V tools, and lets you enjoy the benefits of extended operating time of lithium-ion batteries on existing 18V tools.
  • Use for:Can use the 18V lithium battery and the backup battery in most MAKIT LXT batteries: BL1860B / BL1860 / BL1850B / BL1850 / BL1840 / BL1830B / BL1830 / BL1820 / BL1815 etc.
  • Compatibility:Compatible for Ryobi P102, P103, P104, P105, P107, P108, P109 and fit for Ryobi 18V ONE+ System Cordless Power Tools. (NOTE: Not fit for Ryobi cordless saw P551, for Ryobi 18v radio, lamp eg, for Ryobi P742 P746)
  • Attention:It cannot be used to charge the battery of a power tool, and the adapter cannot be plugged into any charger. If you need to charge the power tool battery, use the original battery charger.
  • High-Quality customer service: We support a 30-day refund and a 180 days warranty. Comply with FCC RoHS and CE safety testing standards. If you have any questions, please feel free to contact us, our team will do our best to satisfy every customer who buys our products.
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