{"title":"Batteries \u0026 save batteries","description":"\u003cp\u003eSave batteries keep the high scores and saved games inside retro cartridges. This page brings together 3 V CR1616, CR1620 and CR1632 lithium coin cells, the 28-pin FRAM memory chip FM1808, FM18W08 or FM16W08 that removes the need for a battery, and the RetroScaler real-time clock board intended for the MiSTer FPGA.\u003c\/p\u003e","products":[{"product_id":"puce-fram-fm1808-fm18w08-fm16w08","title":"28-pin FRAM memory chip FM1808, FM18W08 or FM16W08 — battery-free","description":"\u003ch2 style=\"color:#111213;font-size:1.6em;\"\u003e28-pin FRAM memory chip: the save that survives a dead battery\u003c\/h2\u003e\n\u003cp\u003eOn an arcade board or a retro project, saved data depends on a lithium battery soldered in thirty years ago. The day it gives out, settings, high scores and configuration go with it. \u003cstrong style=\"color:#0097ac;\"\u003eFRAM\u003c\/strong\u003e is non-volatile memory that retains data \u003cstrong style=\"color:#0097ac;\"\u003ewithout a battery\u003c\/strong\u003e and is written at SRAM speed: it is the component fitted in place of the original memory in so-called \u003cstrong style=\"color:#0097ac;\"\u003ebattery-less\u003c\/strong\u003e mods.\u003c\/p\u003e\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong style=\"color:#0097ac;\"\u003eRetains data without power\u003c\/strong\u003e: no lithium battery, no backup capacitor to keep an eye on, no save lost after months in storage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong style=\"color:#0097ac;\"\u003eWrites like an SRAM\u003c\/strong\u003e: immediate parallel access, with no write cycle or programming sequence as on an EEPROM or Flash, and with far higher write endurance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong style=\"color:#0097ac;\"\u003eThree part numbers to choose from\u003c\/strong\u003e: FM1808-70 (5 V, 32 K × 8), FM18W08 (2.7 to 5.5 V, 32 K × 8), FM16W08 (2.7 to 5.5 V, 64 K × 8). Order the one your board expects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eWhat it doesn't do\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIt is not a bypass chip: it is a standard memory component, with no embedded software and no unlocking function.\u003c\/li\u003e\n\u003cli\u003eIt cannot be fitted without soldering: a 28-pin surface-mount component, supplied bare, with no socket or adapter board.\u003c\/li\u003e\n\u003cli\u003eIt does not recover a save that has already been lost: after replacement, the board restarts with blank memory that must be reconfigured.\u003c\/li\u003e\n\u003cli\u003eThe supplier states an SSOP-28 package while the original listing says SOP-28: the exact package width remains \u003cstrong\u003eto be confirmed\u003c\/strong\u003e, so compare your board's footprint before ordering.\u003c\/li\u003e\n\u003cli\u003eThe manufacturer and markings are not guaranteed: component of Chinese origin, sold without a certificate of authenticity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eIntended for boards that use a battery-backed 28-pin parallel memory: arcade boards, retro computing builds, DIY projects. Compatibility is checked against your board's schematic, with the pinout and supply voltage to hand. \u003cstrong style=\"color:#0097ac;\"\u003eDoes not replace\u003c\/strong\u003e an I²C or SPI serial memory, a program EPROM or Flash, or a through-hole DIP-28 package: the format sold here is a surface-mount package.\u003c\/p\u003e\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eSkill level required\u003c\/h3\u003e\n\u003cp\u003eExperienced. You need to desolder the original chip and fit the new one: hot air station or fine-tip iron, flux, desoldering braid, isopropyl alcohol and an anti-static wrist strap. A magnifier or stereo microscope helps a lot with a 28-pin pitch. If you have never done SMD work, practise on a scrap board before touching yours.\u003c\/p\u003e\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eIn the box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 28-pin FRAM memory chip, in the selected part number (FM1808-70-SG, FM18W08-SG or FM16W08-SG).\u003c\/li\u003e\n\u003cli\u003eSold individually: no socket, cable or printed documentation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-top:16px;\"\u003eListing verified on 19 August 2026. Delivery in 10 to 18 days · ships within 3 to 5 days · 2-year legal guarantee · 14-day returns.\u003c\/p\u003e\n\u003cp\u003eRead before ordering: \u003ca href=\"https:\/\/fun-esports.com\/en\/collections\/peripheriques-retro\" style=\"color:#0097ac;\"\u003eRetro peripherals\u003c\/a\u003e\u003c\/p\u003e","brand":"Fun-Esports","offers":[{"title":"FM16W08-SG","offer_id":54540493586765,"sku":"1005003784632135-FM16W08-SG","price":16.99,"currency_code":"EUR","in_stock":true},{"title":"FM18W08-SG","offer_id":54540493619533,"sku":"1005003784632135-FM18W08-SG","price":16.99,"currency_code":"EUR","in_stock":true},{"title":"FM1808-70-SG","offer_id":54540493652301,"sku":"1005003784632135-FM1808-70-SG","price":16.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7636\/5133\/files\/puce-memoire-fram-28-broches-fm1808-fm18w08-ou-fm16w08_036d35fc-50b7-4001-9e8c-b6c47952fbe7.png?v=1787315202"},{"product_id":"piles-bouton-lithium-cr1616-cr1620-cr1632","title":"CR1616, CR1620, CR1632 3 V Lithium Coin Cells — Retro Save Batteries","description":"\u003ch2 style=\"color:#111213;font-size:1.6em;\"\u003e3 V lithium coin cells: saves that hold again\u003c\/h2\u003e\n\u003cp\u003eA cartridge that forgets your progress every time you switch off, an internal clock that resets to zero, a console that loses its settings: nine times out of ten, the \u003cstrong style=\"color:#0097ac;\"\u003esave battery\u003c\/strong\u003e is flat. These \u003cstrong style=\"color:#0097ac;\"\u003e3 V lithium\u003c\/strong\u003e coin cells cover the most common formats in retro hardware — \u003cstrong style=\"color:#0097ac;\"\u003eCR1616, CR1620 and CR1632\u003c\/strong\u003e — in packs of 5 or 10.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong style=\"color:#0097ac;\"\u003eThree formats to choose from\u003c\/strong\u003e: CR1616, CR1620 or CR1632, all 3 V lithium. The format is printed right on the original battery.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong style=\"color:#0097ac;\"\u003eSold in packs\u003c\/strong\u003e: 5 or 10 batteries depending on the variant, enough to handle a whole shelf of cartridges in a single order.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong style=\"color:#0097ac;\"\u003eLithium chemistry\u003c\/strong\u003e: stable 3 V voltage over time, low self-discharge; this is the chemistry originally used in SRAM save cartridges.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eWhat it doesn't do\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eThese are \u003cstrong style=\"color:#0097ac;\"\u003ebare batteries, without solder tabs\u003c\/strong\u003e. In a cartridge, the original battery is soldered in by two tabs: you need either tabbed batteries, a battery holder, or careful soldering — we supply neither tabs nor holder.\u003c\/li\u003e\n  \u003cli\u003eThey are \u003cstrong style=\"color:#0097ac;\"\u003enot rechargeable\u003c\/strong\u003e and do not replace any Li-ion battery in a handheld console.\u003c\/li\u003e\n  \u003cli\u003eChanging the battery \u003cstrong style=\"color:#0097ac;\"\u003eerases the save\u003c\/strong\u003e stored in memory: the SRAM loses power during the operation. Back up whatever needs saving before opening the cartridge.\u003c\/li\u003e\n  \u003cli\u003eA cartridge that no longer saves may also suffer from a broken trace or a dead chip: the battery only fixes the most common case, not all of them.\u003c\/li\u003e\n  \u003cli\u003eNo battery comes with a tool: the gamebit-type screwdriver and the soldering iron are not in the box.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eWhat matters is the \u003cstrong style=\"color:#0097ac;\"\u003eformat\u003c\/strong\u003e, not the machine: order the reference printed on the battery you remove. The CR1616 is the most widespread format in battery-backed Game Boy, Game Boy Color and Game Boy Advance cartridges. The CR1620 and CR1632 are found in other 3 V boards and peripherals, as well as in watches, calculators and electronic toys. Not suitable for slots designed for a CR2025 or CR2032, which are wider: check before ordering.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eSkill level required\u003c\/h3\u003e\n\u003cp\u003eDisassembly of the cartridge or casing, and most often \u003cstrong style=\"color:#0097ac;\"\u003esoldering\u003c\/strong\u003e to reuse the original tabs. Have a screwdriver that fits the cartridge screw, a fine-tip soldering iron and solder ready. Never solder directly onto the body of a coin cell unless you know what you are doing: the heat can damage it.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eIn the box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e5 or 10 lithium coin cells (3 V), in the chosen format (CR1616, CR1620 or CR1632).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp style=\"margin-top:16px;\"\u003eKeep out of reach of children: swallowing a coin cell is a medical emergency. Do not puncture, heat or recharge. Take to a collection point at the end of its life.\u003c\/p\u003e\n\n\u003cp style=\"margin-top:16px;\"\u003eRead before ordering: \u003ca href=\"https:\/\/fun-esports.com\/en\/collections\/atelier-modding\" style=\"color:#0097ac;\"\u003eWorkshop \u0026amp; modding\u003c\/a\u003e\u003c\/p\u003e","brand":"Fun-Esports","offers":[{"title":"CR1616 \/ Pack of 5","offer_id":54540506530125,"sku":"1005008325557763-CR1616 5PCS","price":18.99,"currency_code":"EUR","in_stock":true},{"title":"CR1616 \/ Pack of 10","offer_id":54540506562893,"sku":"1005008325557763-CR1616 10PCS","price":23.99,"currency_code":"EUR","in_stock":true},{"title":"CR1632 \/ Pack of 5","offer_id":54540506595661,"sku":"1005008325557763-CR1632 5PCS","price":18.99,"currency_code":"EUR","in_stock":true},{"title":"CR1632 \/ Pack of 10","offer_id":54540506628429,"sku":"1005008325557763-CR1632 10PCS","price":23.99,"currency_code":"EUR","in_stock":true},{"title":"CR1620 \/ Pack of 5","offer_id":54540506661197,"sku":"1005008325557763-CR1620 5PCS","price":18.99,"currency_code":"EUR","in_stock":true},{"title":"CR1620 \/ Pack of 10","offer_id":54540506693965,"sku":"1005008325557763-CR1620 10PCS","price":23.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7636\/5133\/files\/piles-bouton-lithium-3-v-cr1616-cr1620-cr1632_2bcbc36e-1247-4391-b739-89d831dea54b.png?v=1787315265"},{"product_id":"carte-rtc-mister-fpga-retroscaler","title":"Real-time clock RTC board for MiSTer FPGA — RetroScaler","description":"\u003ch2 style=\"color:#111213;font-size:1.6em;\"\u003eMiSTer FPGA RTC board: the right date and time, even without a network\u003c\/h2\u003e\n\u003cp\u003eA \u003cstrong style=\"color:#0097ac;\"\u003eMiSTer FPGA\u003c\/strong\u003e has no battery-backed clock: every time it's powered on, it starts with no date or time and waits for a network connection to provide them. On an offline setup, the Amiga, MSX, PC-XT or file browser end up with a bogus date. This \u003cstrong style=\"color:#0097ac;\"\u003eRetroScaler RTC board\u003c\/strong\u003e adds a battery-powered clock that keeps running while the MiSTer is switched off, and that the system reads back at startup.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong style=\"color:#0097ac;\"\u003eKeeps time while powered off\u003c\/strong\u003e: the clock stays powered by a coin cell battery when the MiSTer is unplugged.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong style=\"color:#0097ac;\"\u003eRestores the date at startup\u003c\/strong\u003e: cores and saved files get a consistent timestamp, without going through Wi-Fi or Ethernet.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong style=\"color:#0097ac;\"\u003eCompact format\u003c\/strong\u003e: approximately 3.7 × 3.6 × 0.5 cm, designed to stay in a MiSTer case that's already well filled.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eWhat it doesn't do\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eImproves neither the performance nor the compatibility of cores: it's a clock, not an SDRAM board or a memory expansion.\u003c\/li\u003e\n  \u003cli\u003eDoesn't replace a network connection: core and firmware updates still require the Internet.\u003c\/li\u003e\n  \u003cli\u003eDoesn't work on its own: you need a MiSTer FPGA built on a Terasic DE10-Nano board, with an up-to-date MiSTer Main and RTC support enabled.\u003c\/li\u003e\n  \u003cli\u003eIsn't a cartridge save battery: it doesn't restore the saves of a real Game Boy, Mega Drive or Super Nintendo cartridge.\u003c\/li\u003e\n  \u003cli\u003eA coin cell battery isn't guaranteed to be in the box — have one ready.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned for a \u003cstrong style=\"color:#0097ac;\"\u003eMiSTer FPGA\u003c\/strong\u003e built around the Terasic DE10-Nano board, via the expansion connector. It isn't intended for mini PCs and Android emulation boxes, retro handheld consoles or original consoles. Other development boards (DE10-Standard, DE1-SoC…) aren't covered. Check the space available in your case before ordering.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eSkill level required\u003c\/h3\u003e\n\u003cp\u003eInstallation for someone who has already opened their MiSTer: the board goes on the expansion connector, with the MiSTer switched off and unplugged, observing the pin orientation. The manufacturer mentions hand-soldered assembly, which describes how the board is made, not soldering you have to do at home. On the software side, the clock must be recognised by MiSTer Main; allow a few minutes of configuration after the first startup.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#111213;font-size:1.35em;\"\u003eIn the box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 real-time clock RTC board for MiSTer FPGA (RetroScaler).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp style=\"margin-top:16px;\"\u003eRead before ordering: \u003ca href=\"https:\/\/fun-esports.com\/en\/collections\/atelier-modding\" style=\"color:#0097ac;\"\u003eWorkshop \u0026amp; Modding\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eDelivery in 10 to 18 days · ships within 3 to 5 days · 2-year legal guarantee · 14-day returns.\u003c\/p\u003e","brand":"Fun-Esports","offers":[{"title":"RTC","offer_id":54540518195533,"sku":"1005001406387391-RTC","price":43.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7636\/5133\/files\/carte-horloge-temps-reel-rtc-pour-mister-fpga_35391572-61fc-47c3-b625-0644584ebb5e.png?v=1787320594"}],"url":"https:\/\/fun-esports.com\/en\/collections\/piles-sauvegarde.oembed","provider":"Fun-Esports","version":"1.0","type":"link"}