Cranes, remote-control units, heated apparel, and industrial sensors all depend on compact, low-voltage cells that won’t quit mid-shift. The right 3.7V rechargeable battery keeps a remote-control site humming through long shifts, powers a heated vest across a full workday in freezing temps, and keeps telemetry sensors reporting for years without a swap.
This roundup covers packs, cells, and chargers spanning genuine rechargeable 3.7V lithium chemistry plus a few closely related 3.6V options that share the same form factor. Industrial radio users get two-prong Hetronic replacements, hobbyists get a flexible multi-format smart charger, cold-weather workers get a high-capacity heated-apparel bank, and instrument techs get long-life lithium thionyl chloride (Li-SOCl₂) primaries for metering gear.
A Side-By-Side Look
Zivases 3.6V 2100mAh Ni-MH Battery for Hetronic Remote (2-Pack)
Swanlake Universal 18650/AA/AAA Fast Charger
Venustas [email protected] Heated Apparel Battery Pack
Zivases UCH-2 Hetronic Battery Charger (US Plug)
Zivases UCH-2 Hetronic Battery Charger (12V DC)
EEMB ER18505 3.6V 4100mAh Li-SOCl₂ (Single Cell)
EEMB ER18505 3.6V 4100mAh Li-SOCl₂ (4-Pack)
EEMB ER18505 3.6V 4100mAh Li-SOCl₂ (10-Pack)
EEMB ER18505 3.6V 4100mAh Li-SOCl₂ (6-Pack)
Zivases Hetronic UCH-2 Charger 90-270VAC (US Plug)
The Details Behind The Selections
The Zivases 68300900 replacement targets a very specific niche: industrial radio remote controls used on overhead cranes, hoists, and concrete pumps. Each cell ships at 3.6V with a 2100mAh capacity, and the pack of two keeps a backup ready for the moment a primary dies mid-shift. The grey housing matches the OEM-style form factor that slides directly into Hetronic-style transmitters.
Crane operators juggling eight-hour shifts get genuine peace of mind from a swappable spare. Compared to the higher-capacity Venustas pack covered later, this one is purpose-built for a far narrower application, but it does that job without fuss. If your transmitter uses the 68300900 part number, this Zivases pair drops in cleanly.
Good Reasons To Consider
- Direct replacement for Hetronic 68300900 transmitters, no rewiring required
- 2100mAh capacity supports a full shift on most crane remotes
- Two-pack format means you always have a charged spare ready
- Ni-MH chemistry avoids the shipping restrictions tied to loose lithium cells
Things To Consider
- Only fits Hetronic 68300900 and 68300990 transmitters, no other devices
- Requires the matching UCH-2 charger (sold separately, covered below)
- Ni-MH self-discharges faster than lithium, so spares idle out within weeks
Feature Snapshot
Built With In Mind
Industrial crane and hoist operators running Hetronic transmitters on multi-shift rotations need a swap-ready spare that fits without adapters.
Skip It When
Pick the Venustas 20000mAh pack instead if your gear is heated apparel rather than a Hetronic remote, since the connector and voltage profile are completely different.
The Swanlake charger is the household workhorse for anyone juggling flashlight cells, vape mods, and remote batteries on the same countertop. It accepts an unusually long list of sizes: 18650, 18500, 14500, 21700, 17500, 16340, 26650, and 20700 on the lithium side, plus standard AA, AAA, and C cells in Ni-MH or Ni-Cd. The slot design uses spring-loaded contacts that adjust automatically.
For most homes, the LCD readout becomes the killer feature, showing each cell’s charge level in 25% increments and cutting power once a battery tops off. Three current modes (500mA, 1A, 2A) are switchable via the front-panel Q1 button, so small 14500 cells charge gently while big 26650s can take a faster top-up. No batteries ship in the box, just the charger itself.
Notable Upsides
- Eight lithium formats plus AA/AAA/C Ni-MH in one unit
- Selectable 0.5A, 1A, and 2A modes prevent small cells from overheating
- LCD indicator with auto shutoff at full charge
Worth Noting
- Batteries are not included, so a first purchase means buying cells separately
- Higher 2A mode only applies to certain slots, not every bay simultaneously
- Plastic housing feels light in hand, so owners commonly report careful cable management matters
Who Should Grab It
Shoppers running a mixed battery household of flashlights, headlamps, and remote controls want one dock that handles every format without juggling separate chargers.
Consider Something Else When
Switch to the Zivases UCH-2 charger below if your only battery is a Hetronic 68300900, since the Swanlake lacks the proprietary connector that remote needs.
The Venustas pack leans hard into one audience: people working outside in winter who run heated vests, jackets, or hoodies. Rated at [email protected] (74Wh), it doubles as a portable power bank for phones and headlamps during long days. The dual-voltage output (7.4V or 12V) supports a wider range of heated-garment models than a fixed-output cell.
For most cold-weather crews, a single charge covers several shifts at lower heat settings, which is the realistic use pattern. Compared to the small Hetronic batteries earlier in this list, this one trades compact size for outright endurance. Recharging takes a few hours from a 20V-class wall adapter, so the pack needs an overnight top-up between heavy-use days.
Real Benefits
- 20000mAh capacity runs a heated vest through a full workday at medium settings
- 7.4V/12V dual output covers most third-party heated apparel on the market
- Doubles as a standard USB power bank for phones and GPS units
- Rugged outer shell handles job-site drops better than phone-style banks
Room For Improvement
- Bulky shape is uncomfortable in a jacket pocket during high-output activity
- Charge time stretches to several hours without a higher-wattage adapter
- Not compatible with non-Venustas heated gear that uses proprietary plugs, so owners commonly verify the connector first
Made For
Construction, surveying, and warehouse crews working outdoors below freezing need a battery that survives a long shift without mid-day recharging.
Not Your Match When
Skip this Venustas pack if you only need to charge AA cells and 18650s, since the Swanlake charger above handles that workload in a smaller footprint.
The Zivases UCH-2 with US plug is the wall-mounted companion to the Hetronic batteries covered in pick-1. It accepts a wide 90-270VAC input, which makes it usable on overseas job sites with a basic plug adapter. Output sits at 300 or 780mA depending on the battery’s charge state.
For most shop-floor setups, the wall-plug form factor is the right pick: drop the depleted battery in at the end of a shift, walk away, and the next operator grabs a topped-off pack the next morning. The 270V ceiling also future-proofs the unit if a site runs a non-standard mains supply. There’s no battery in the box, just the charger.
Standout Benefits
- 90-270VAC input works with virtually any mains supply worldwide
- Two-stage output (300mA/780mA) handles both slow and faster top-ups
- US plug ships ready for North American outlets
- Dedicated cradle fits 68300900 and 68301000 batteries without forcing them
Points To Note
- Single-bay design means charging two batteries requires two units or a wait
- No status LED or display, so completion is estimated, not confirmed
- Battery itself is sold separately from the matching Zivases pack
Best Suited To
Shop supervisors running multiple crane remotes need a permanent bench charger that handles odd mains voltages without an extra transformer.
A Better Fit Elsewhere
Pick the Zivases 12V DC variant below if your work happens on a service truck rather than inside a shop, since a wall-plug charger is dead weight on the road.
Where the US-plug model covers the bench, this 12V DC variant lives in the truck cab. The 10-30V input range means it works from any standard vehicle socket, including service trucks, fork lifts with auxiliary power, and portable battery boxes. The output mirrors its wall-mounted sibling at 300/780mA.
For most mobile crane technicians, having the charger run off the same power source that runs everything else in the truck removes one more wall-outlet dependency. Compared to pick-4’s wall-plug variant, this unit trades indoor convenience for genuine portability. Battery not included, and the cradle still accepts the 68300900 and 68300990 packs.
Points In Its Favor
- 10-30V DC input runs from any vehicle socket or portable power station
- Same two-stage output as the wall-plug variant
- Compact housing fits in a tool drawer or under a truck seat
- Useful on remote job sites with no mains power available
Trade Offs
- Trickle charges the battery slowly when the vehicle is off to avoid draining the starter
- Requires a 12V cigarette-style socket, which newer trucks increasingly omit
- Charging time stretches in cold weather when vehicle voltage drops below 13V
Whose Shelf It Belongs On
Field service technicians driving between crane sites need a charger that works from the truck’s electrical system without hunting for an outlet.
Look Elsewhere When
Choose the AC wall-plug Zivases UCH-2 in pick-4 if the charger stays on a shop bench, since DC charging on parked mains power adds unnecessary complexity indoors.
The EEMB ER18505 takes the list in a different direction. This is a non-rechargeable lithium thionyl chloride cell in the A-size (18.5×50.5mm) form factor, designed for metering, alarm, and sensor equipment that draws tiny current over years. It ships as a single 3.6V 4100mAh unit, and absolutely should not be charged. The trade-off is a 10+ year standby life that beats rechargeable cells for low-drain applications.
For most metering technicians, that long shelf life is the actual selling point: a water or gas logger left in the field for five years without a service call is worth the upfront cost. Operating temps span -55°C to +85°C, so outdoor enclosures in harsh climates are fine. It’s a primary cell, meaning once depleted it’s replaced rather than recharged.
Useful Highlights
- 4100mAh capacity supports multi-year deployment in low-drain meters
- -55°C to +85°C operating range handles outdoor enclosures and cold rooms
- Long shelf life means spares stay usable for over a decade in storage
Honest Caveats
- Non-rechargeable chemistry means replacement, not topping off, when depleted
- Passivation effect can cause initial voltage dip after long storage, though it recovers with use
- Single-cell packaging offers no redundancy for critical instrumentation
Who Will Love This
Utility meter techs and alarm installers stocking for low-power remote sensors benefit from a cell that sits on a shelf for years without losing charge.
Reach For A Different Pick When
Move to the Zivases 3.6V Hetronic pack in pick-1 if the device needs repeated recharging rather than a one-time multi-year deployment.
The 4-pack of EEMB ER18505 cells solves the same metering problem as the single-cell version, but at a lower per-cell cost. Same 3.6V 4100mAh Li-SOCl₂ chemistry, same wide temperature window, same non-rechargeable design. The extra cells let a small service shop cover multiple installs without reordering for months.
Compared to the single-cell option above, this 4-pack trades minimum commitment for tangible savings. For most service technicians handling a queue of meter swaps, having a few extras means the next job never waits on shipping. As with the single cell, these should never be placed on a charger.
What Works In Its Favor
- Lower cost per cell than buying singles
- Same long shelf life as the single-cell sibling
- Wide -55°C to +85°C operating range for outdoor sensor enclosures
Small Caveats
- Storage after opening should still be cool and dry to preserve passivation recovery
- Once a cell is used, you cannot top it off like the Ni-MH options earlier in this list
- No included holders, so loose cells need a parts drawer or labelled bin
Perfect Match For
Small instrumentation shops installing a handful of metering or alarm devices a month benefit from buying in modest bulk without committing to a 10-pack.
Swap It Out When
Jump to the EEMB 10-pack in pick-8 if you’re stocking a full maintenance van for a year, since larger packs cut the per-cell cost further.
For facilities crews replacing cells across an entire building’s metering network, the 10-pack delivers the lowest cost per cell of any Li-SOCl₂ option in this roundup. Same specs as the 4-pack: 3.6V, 4100mAh, A-size 18.5×50.5mm, non-rechargeable. The bulk format only makes sense if you’re committing to multiple installations or building a long-term spares cache.
For most plant electricians, the math is straightforward. A building with twenty metering points eats through more cells in a service rotation than a single technician will install in a year, and shelf life is long enough that overbuying is low-risk. As with the other EEMB entries, never attempt to charge these.
Reasons It Performs
- Lowest per-cell cost across all EEMB pack sizes in this list
- Multi-year shelf life makes over-buying a low-risk strategy
- Same wide operating temperature envelope as smaller packs
- Useful for rotating spares across multiple job sites
Areas To Watch
- Upfront cost is high even with bulk savings, so casual users should stick to the 4-pack
- Storage space matters once opened, since loose cells need a cool, dry spot to preserve shelf life
- Bulk packaging may arrive in a single box with no individual date codes
The Right Fit
Plant maintenance teams running scheduled cell replacements across a large metering estate benefit from stocking once and forgetting the reorder queue.
Another Choice May Suit
Pick the 4-pack in pick-7 if you’re only rotating a handful of cells per year, since the smaller pack offers the same chemistry without locking up capital.
The 6-pack sits in the middle of EEMB’s bulk options and offers a balance between per-cell savings and storage commitment. Same chemistry and physical size as the 4-pack and 10-pack, just a different pack-out for shops with moderate annual demand. UL-listed with RoHS and UN 38.3 compliance for transport.
For most on-call service technicians, six cells cover two to three years of replacements with comfortable margin. The 18.5×50.5mm A-size fits common metering hardware, alarm panels, and data-logging sensors. As before, these are primary cells and should never be charged.
Everyday Perks
- Mid-tier bulk size suits shops with steady but moderate cell demand
- Per-cell cost sits between the 4-pack and 10-pack
- Wide -55°C to +85°C tolerance for outdoor enclosures
- Listed with UL, RoHS, and UN 38.3 safety documentation
Where It Is Less Suited
- Passivation voltage dip after long storage can confuse new users, though EEMB offers replacement
- No charging pathway means depleted cells become waste rather than refreshed spares
- Date coding is not always visible on the outer packaging
Who It Suits Best
Service techs handling a mix of alarm, sensor, and metering clients appreciate a 6-pack that outlasts a single reorder cycle without sitting around for years.
Where Another Pick Suits Better
Choose the Venustas 20000mAh pack in pick-3 if the equipment is heated apparel, since Li-SOCl₂ primaries cannot power anything that draws meaningful current continuously.
This second Zivases wall charger is functionally very close to pick-4 but is sold as a complete kit description including the battery specs. The 90-270VAC input, 300/780mA output, and US plug match the earlier UCH-2 exactly. The listing notes the rechargeable chemistry and 2100mAh capacity that pairs with the 68300900 battery.
For most multi-shift industrial sites, having two chargers on the bench means one battery can charge while the other lives in the remote, eliminating downtime at handoff. Compared to the 12V DC variant, this stays put on the workbench rather than riding in a truck. Battery ships separately.
Positive Points
- Wide 90-270VAC input handles odd mains voltages on overseas sites
- Dedicated cradle built for 68300900 and 68300990 batteries
- Two-stage output matches charge-state needs of the Hetronic pack
- US plug ships ready for North American outlets
Factors To Consider
- Single-bay design, so rotating multiple batteries still needs more than one unit
- Charging completion has no clear LED or tone, so owners commonly plan around the rated charge time
- The cradle is keyed to one battery model and won’t accept other Hetronic variants
Built With In Mind
Industrial sites with two or three shifts rotating the same crane remotes benefit from dedicated bench chargers that refill batteries between handoffs.
Not Your Match When
Pick the Swanlake multi-format charger in pick-2 if you also need to charge 18650 flashlight cells, since this Zivases unit only fits the Hetronic form factor.
Matching 3 7 Volt Rechargeable Battery To The Job
Choosing the right cell starts with the device, not the battery. Industrial remote controls and heated apparel want rechargeable chemistries that deliver steady current over hours. Metering and alarm equipment usually wants long-life lithium thionyl chloride primaries that sit idle for years between service calls. Mixing those two needs leads to overspending or underwhelming performance.
Voltage is the first hard filter. A nominal 3.7V lithium cell typically measures 4.2V fully charged and 3.0V depleted, while the 3.6V Ni-MH pack from Zivases hovers closer to a flat discharge curve. Match the chemistry to the device’s expected drain profile: high and steady for heated gear, low and intermittent for sensors. Capacity ratings tell you how long a charge lasts, but only if the device’s draw stays in the cell’s comfortable range. Deep-cycle stress on a small Li-SOCl₂ primary will shorten its life dramatically.
Form factor matters more than shoppers expect. The ER18505 A-size cell is 18.5×50.5mm and physically incompatible with anything designed for AA or 18650 geometry. The Hetronic 68300900 uses a proprietary rectangular pack that only fits a UCH-2 cradle. Confirm the battery’s dimensions against the device’s battery compartment before ordering, especially on industrial gear where spec sheets sometimes skip dimensional drawings.
Charger compatibility is its own decision. A universal charger like the Swanlake handles hobby and household cells but cannot dock Hetronic packs. A dedicated UCH-2 charger only fits its own battery family. For most mixed fleets, owning both a universal bench unit and one or two specialty chargers covers everything without expensive duplicates.
Key Considerations Across These Picks
Traps First Timers Fall Into
A common error is treating non-rechargeable Li-SOCl₂ cells like the rechargeable Ni-MH or lithium-ion packs elsewhere in the list. Charging a primary cell risks venting, overheating, or rupture. Always match the charger to the chemistry printed on the cell. Another slip-up is buying 18650 cells without checking button-top versus flat-top geometry, since some flashlights only accept one style. Finally, shoppers occasionally ignore the operating temperature range and end up with a cell that works fine indoors but dies in a frozen enclosure.
Where The Extra Money Goes
Higher-capacity heated apparel packs like the Venustas bank cost more because they use premium lithium-polymer cells, higher-grade battery management boards, and ruggedized enclosures. The bulk format EEMB packs cut per-cell cost by trimming packaging and shipping overhead, not by skimping on the cell itself. Industrial-grade Hetronic replacements carry a price premium tied to low production runs and the niche application. Most of the extra spend on any of these goes into manufacturing consistency and safety documentation rather than raw capacity numbers.
Frequently Asked Questions
Can You Charge A 3.7V Lithium Battery With Any Charger?
No, a 3.7V lithium-ion or lithium-polymer cell needs a charger designed for its specific chemistry and voltage profile. Using a Ni-MH or lead-acid charger risks overcharging, overheating, or cell damage. The Swanlake multi-format charger handles most consumer lithium-ion cells, while the Zivases UCH-2 is purpose-built for the Hetronic 68300900 pack.
What Is The Difference Between 3.6V And 3.7V Batteries?
The 3.6V label usually refers to Ni-MH packs or lithium thionyl chloride primary cells with a flatter discharge curve, while 3.7V typically describes rechargeable lithium-ion or lithium-polymer cells that swing from 4.2V full to 3.0V depleted. Many devices accept either, but chargers and protection circuits are not interchangeable between the two.
How Long Do Lithium Thionyl Chloride Batteries Last?
In low-drain metering and alarm applications, Li-SOCl₂ cells like the EEMB ER18505 routinely deliver five to ten years of service before depletion. Shelf life on a stored cell can exceed a decade at room temperature. The actual runtime depends entirely on the device’s average current consumption and duty cycle.
Are 18650 And 14500 Batteries Interchangeable?
No, the two sizes differ in length and diameter, so an 18650 will not fit a 14500 slot and vice versa. A multi-format charger like the Swanlake handles both, plus several other sizes, but the cells themselves stay in their own categories. Some devices list equivalent model numbers, so always check the device manual before substituting.
Do Heated Apparel Batteries Work As Regular Power Banks?
Many heated-vest batteries, including the Venustas pack, do double as USB power sources for phones and headlamps. Output current and connector types vary by model, so check the USB-A or USB-C rating on the pack before relying on it for high-draw devices. Larger heated-apparel packs usually outperform small dedicated power banks on capacity.
Bottom Line
The right pick depends entirely on the device you are trying to power. Crane operators running Hetronic remotes should pair the Zivases battery pack with the matching UCH-2 charger, choosing the wall-plug or 12V DC variant based on whether the charger lives on a bench or in a truck. Heated apparel users in cold climates get the most from the Venustas high-capacity bank. Metering techs and alarm installers stocking for low-drain sensors should lean toward the EEMB ER18505 packs, choosing the size that matches their annual turnover.