--- product_id: 593078524 title: "TecMate OptiMate DC to DC TM500, 6-stage encapsulated battery-saving 12V/12.8V 2A DC/DC charger and maintenance device" brand: "optimate" price: "€ 173.58" currency: EUR in_stock: true reviews_count: 5 category: "Opti Mate" url: https://www.desertcart.it/products/593078524-tecmate-optimate-dc-to-dc-tm500-6-stage-encapsulated-battery store_origin: IT region: Italy --- # 2A DC/DC power output 6-stage smart charging Battery BMS reset & protection TecMate OptiMate DC to DC TM500, 6-stage encapsulated battery-saving 12V/12.8V 2A DC/DC charger and maintenance device **Brand:** optimate **Price:** € 173.58 **Availability:** ✅ In Stock ## Summary > 🔌 Power up anywhere, keep your battery future-proof! ## Quick Answers - **What is this?** TecMate OptiMate DC to DC TM500, 6-stage encapsulated battery-saving 12V/12.8V 2A DC/DC charger and maintenance device by optimate - **How much does it cost?** € 173.58 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/593078524-tecmate-optimate-dc-to-dc-tm500-6-stage-encapsulated-battery) ## Best For - optimate enthusiasts ## Why This Product - Trusted optimate brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **24/7 Maintenance Mode:** Sleep and monitoring mode ensures your battery stays fully charged and ready, even during long storage periods. - • **Smart 6-Stage Charging:** Optimizes battery health with precision charging cycles for AGM, GEL, STD, and LiFePO4 batteries. - • **Off-Grid Power Solution:** Charges directly from any 12V-16V DC source—no AC power needed, perfect for remote or garage storage. - • **BMS Reactivation & Rescue:** Safely revives deeply discharged lithium batteries and resets battery management systems to extend lifespan. - • **Source Battery Protection:** Prevents complete discharge with low voltage shutdown and LED alerts, safeguarding your power source. ## Overview The TecMate OptiMate TM500 is a compact, 6-stage DC/DC charger designed to maintain and revive 12V lead-acid and 12.8V LiFePO4 batteries using power from another 12V source. Ideal for off-grid or garage storage, it features smart charging, BMS reset capabilities, and continuous maintenance modes to maximize battery life and reliability without AC power. ## Description OptiMate DC-DC 12V 2A, the ideal off-grid charging and maintenance device for your 12V lead-acid or 12.8V LifePO4/LFP lithium battery that draws power from another 12V battery - no AC required! Review: Super Lösung, wenn man das Auto in einer Garage ohne 230v Stromanschluss überwintern lassen möchte. Gibt wenige fertige DC-DC Lösungen und der OptiMate ist mit seinen ca.90€ leider wirklich die günstigste. Funktioniert einwandfrei, nur könnte der Hersteller flexiblere Kabel verwenden, die verbauten werden bei Minusgraden sehr steif. Review: I use this to trickle charge a 100ah lifepo4 battery from my lighter socket in my van. Works great for keeping the battery topped up between camping trips. No issues so far and really easy to install. Good build quality too. ## Features - Power supply from a 12V - 16V DC source, such as a 12V/12.8V battery, 12V 50W DC power supply or 12V vehicle system. - Automatically charge and maintain your 12V lead-acid battery (AGM, GEL or STD) or your 12.8V/13.2V LiFePO4/LFP battery. - The ideal charger for your deeply discharged battery or to reset the BMS of your lithium battery - reactivates and protects your battery! ! - The safe off-grid rescue solution for deeply discharged lithium batteries, including BMS alarm pulse - safely brings lithium back to full charge! - Protects the source battery from complete discharge, LED warning when there is too little power and low voltage shutdown. - OptiMate Off-grid 24-7 maintenance with sleep/monitoring mode - extended 24-7 maintenance of the battery of your stored vehicle! ! ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08CHCBZN3 | | Item model number | TM-500v3 | | Manufacturer | TecMate International NV/SA | | Product Dimensions | 6.5 x 21 x 16 cm; 750 g | ## Product Details - **Brand:** OptiMate - **Colour:** orange - **Item weight:** 750 Grams - **Output voltage:** 12 Volts (DC) - **Product dimensions:** 6.5D x 17W x 5H centimeters ## Images ![TecMate OptiMate DC to DC TM500, 6-stage encapsulated battery-saving 12V/12.8V 2A DC/DC charger and maintenance device - Image 1](https://m.media-amazon.com/images/I/81n6vNZFdjL.jpg) ## Questions & Answers **Q: will this charger allow the battery being charged to back feed to the charging battery? I want to use it to charge a battery mounted on a trailer .** A: Hello, The TM500 will use the source battery to charge a secondary battery; it will not back feed current into the main (source battery). An example that people use is to use the trailer’s starter battery to charge a powersport battery while driving the trailer. Hope this helps. **Q: Can I use Led acid to charge lithium?** A: No, **Q: Will this charger attain a higher output voltage than it's power source?** A: It depends what the user means upon this question. Here I explain by two viewpoints. From energy converting point of view, of course that input power energy is bigger than output energy. The energy is calculated as voltage times current. From voltage point of view, input voltage can be less than output voltage, so input voltage of source battery or power source can be less than under-charged battery. For example, input battery voltage can be 13V while output battery voltage can be 13.6V. But input current must be bigger than output current. So, energy of input as voltage times current is larger than that of output voltage times current. **Q: See that it is stated for use with lower AH batteries. I’m looking to charge 110ah batteries with no more than 20% discharge. May this work?** A: It would be like a maintenance charge. It’s max about 2 amps so about 10 hours to get 20ah ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by S***Y on 2 December 2023* Super Lösung, wenn man das Auto in einer Garage ohne 230v Stromanschluss überwintern lassen möchte. Gibt wenige fertige DC-DC Lösungen und der OptiMate ist mit seinen ca.90€ leider wirklich die günstigste. Funktioniert einwandfrei, nur könnte der Hersteller flexiblere Kabel verwenden, die verbauten werden bei Minusgraden sehr steif. ### ⭐⭐⭐⭐⭐ Review *by C***. on 7 June 2024* I use this to trickle charge a 100ah lifepo4 battery from my lighter socket in my van. Works great for keeping the battery topped up between camping trips. No issues so far and really easy to install. Good build quality too. ### ⭐⭐⭐⭐⭐ Review *by A***ー on 6 January 2025* マンション駐車場ではAC電源が利用できないため、ポタ電からの12Vでバッテリーの補充電に利用中。300Whのポタ電から、A/C出力だと変換効率の点で2日ほどしか持たず実用的ではないが、D/Cであれば10日間ほど補充電を続けられる。 ## Frequently Bought Together - TecMATE Optimate DC to DC, TM-500v3, 6-Step 12V/12.8V 2A Sealed Battery Saving Charger & Maintainer - TECMATE Optimate Cable O-12, Adapter, SAE to AUTO Plug --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.it/products/593078524-tecmate-optimate-dc-to-dc-tm500-6-stage-encapsulated-battery](https://www.desertcart.it/products/593078524-tecmate-optimate-dc-to-dc-tm500-6-stage-encapsulated-battery) --- *Product available on Desertcart Italy* *Store origin: IT* *Last updated: 2026-05-09*