Company: Batterysmith · Founded: 2023 (per the company) · Location: Not published · Category: Electric reel batteries
Batterysmith sells lithium-ion battery packs made for electric fishing reels, in six sizes from 3,500mAh to 20,000mAh. All are 14.8V packs (16.8V fully charged) that come with a charger, and the smaller ones take a choice of adapter cable for Shimano, Daiwa or Banax Kaigen reels. Prices run from $129 to $349, well under most US deep drop battery brands.
The catch is transparency. Batterysmith doesn’t publish where it’s based, its warranty terms on the product pages, or a maximum current rating for any pack, and a couple of its listings contradict themselves. This review sets out what the product pages actually say and where you should ask questions before buying.
Company overview
Batterysmith says it “specializes in crafting marine lithium batteries for fishing enthusiasts.” Its “Our Story” page says the idea came “In 2023, during a pivotal deep-sea fishing expedition with my friend Smith.” The site’s tagline is “Everything You Need to Power Your Electric Reel.”
We couldn’t find a street address, phone number or country of operation on batterysmith.com. Contact is through a web form, Facebook and Instagram (@batterysmith.andy). The site links to a warranty policy page, but the product pages we read don’t state warranty length. Sales are online through batterysmith.com.
At a glance
| Brand | Batterysmith |
| Packs | 3,500, 5,000, 7,000, 10,000, 15,000 and 20,000mAh |
| Voltage | 14.8V nominal, 16.8V full charge |
| Chemistry | Lithium-ion; Batterysmith says “Grade A” Panasonic, Samsung or LG cells |
| Reel fit | Shimano and Daiwa 2-pin reels, Daiwa Seaborg 800MJ–1200MJ, Banax Kaigen (by cable) |
| Not for | Shimano 6-pin reels and 24V Miya Epoch reels (per Batterysmith) |
| Max current | Not published |
| Price range | $129–$349 (batterysmith.com, September 2026) |
Small packs: 3,500mAh to 10,000mAh
Images: Batterysmith
The small packs are tube-shaped, about 1.65–1.85″ square, and are meant to strap to the rod or sit in a pocket. The 7,000 and 10,000mAh kits include an extension cable and a choice of four adapter cables.
| Pack | Energy | Weight | Size | Charger | Claimed fishing time | Price |
|---|---|---|---|---|---|---|
| 3,500mAh | Not published | Not published | Not published | Included | Not published | $139 (was $179); a second 14.8V listing at $129 |
| 5,000mAh | 74Wh | 380 g (13.4 oz) | 1.85 × 1.85 × 4.88″ | 16.8V 1.5A | 8–16 h | $149 |
| 7,000mAh | 103.6Wh | 500 g (1.1 lb) | 1.65 × 1.65 × 7.1″ | 16.8V 1.5A | 12–24 h | $169 (was $250); battery only $139 |
| 10,000mAh | 103.6Wh listed (see note) | 700 g (1.4 lb) | 1.85 × 1.85 × 7.6″ | 16.8V 1.5A | 15–48 h | $219 (was $299) |
Specs and prices from batterysmith.com product and collection pages, September 2026. The 5,000mAh kit “Does Not Include Extension Cable.”
Watch the listings. The 10,000mAh product page gives the same 103.6Wh (7Ah) figure as the 7,000mAh pack. A 10Ah pack at 14.8V would be about 148Wh. The 7,000mAh product page is also titled “Small Edition, 3,500 mAh.” Ask Batterysmith to confirm the capacity in writing before you order.
Adapter cables (small packs)
- Cable A: Shimano BeastMaster, ForceMaster, Plays, Plemio (2-pin)
- Cable B: Daiwa Tanacom, Seapower, Seaborg 200–750, Leobritz (2-pin)
- Cable C: Daiwa Seaborg 800MJ–1200MJ (2-pin)
- Cable D: Banax Kaigen (2-pin)
A separate 2-core extension cable (about 9.8 ft) starts at $25.99.
Large packs: 15,000mAh and 20,000mAh
The two big packs are flat bricks (1.8 × 4.1 × 8.2″) with a silicone cover and a faster 16.8V 3A charger. Batterysmith says they “support 3 electric reel at the same time.”
| Pack | Energy | Weight | Claimed fishing time | Price |
|---|---|---|---|---|
| 15,000mAh | 15Ah / 222Wh | 1.3 kg (2.9 lb) | 30–120 h | $299 on the product page; $269 (was $399) on the collection page |
| 20,000mAh | 20Ah / 296Wh | 1.65 kg (3.9 lb) | 48–168 h | $349 (was $499) |
Both product pages showed “out of stock” in September 2026, while the collection page showed them in stock. Check before ordering.
Current draw: the spec Batterysmith doesn’t publish
Capacity tells you how long a pack lasts. Current rating tells you whether it can handle the pull when a big fish or a heavy lead is coming up. Batterysmith doesn’t publish a continuous or peak current rating, or its BMS limit, for any pack.
Its own blog says Daiwa reels “draw around 12-15 amps of current during operation.” That’s a typical figure, not a ceiling. Daiwa rates the Seaborg 800MJ at up to 20 A peak, and a vendor on The Hull Truth said the Banax Kaigen 1000 limits current to 25 A. Batterysmith sells cables for both reels. If you fish big reels hard, ask Batterysmith for the pack’s continuous and peak rating before relying on a small 3,500–7,000mAh pack.
Choosing a Batterysmith pack
| How you fish | Pack |
|---|---|
| Compact reel, half-day trips, light leads | 5,000mAh |
| One Shimano or Daiwa reel, full day, 400–800 ft | 7,000mAh |
| Seaborg 800MJ or Kaigen, heavy leads | 10,000mAh or larger, after confirming current rating |
| Two or three reels from one battery | 15,000 or 20,000mAh |
| Shimano 6-pin or 24V Miya Epoch | Not compatible; see Shimano or Miya Epoch batteries |
These are our suggestions based on Batterysmith’s published capacities.
One real-world report: a Hull Truth member wrote in October 2024, “I used the batterysmith 7000 for deep dropping. I’ve fished about 400ft – 800ft all day.” That’s a typical Florida tilefish and snowy grouper depth.
Using a small pack offshore
- Strap the pack to the rod butt or keep it in a dry bag. Batterysmith doesn’t publish a waterproof rating.
- Rinse the adapter plugs with fresh water and let them dry before storage. Corroded pins cause more “dead battery” calls than empty cells.
- Carry a spare pack rather than one oversized pack if you swap between reels.
- Keep packs out of the sun on the console. Lithium-ion doesn’t like Florida summer heat.
Pros and cons
Pros
- Low prices: a 7,000mAh kit for $169, a 20,000mAh kit for $349
- Six sizes, from pocket packs to three-reel bricks
- Charger included; cables for Shimano, Daiwa, Seaborg MJ and Banax Kaigen
- Weights and dimensions published for most packs
Cons
- No published maximum current rating
- No published address or country, and no warranty length on the product pages
- Conflicting capacity and stock information across listings
- Very wide “hours of fishing” claims that aren’t tied to depth or load
- Won’t run Shimano 6-pin or 24V Miya Epoch reels
Batterysmith vs. other electric reel batteries
| Brand | Deep drop pack | Price |
|---|---|---|
| Batterysmith | 7,000mAh / 10,000mAh / 15,000mAh, 14.8V | $169 / $219 / $269–$299 |
| Abyss Battery | Deep-Drop 10Ah, 14.8V (Largo, FL) | $299.99 |
| Black Oak LED | 10Ah LiFePO4 (Sarasota, FL) | $274.50 sale / $343.13 |
| BatPower | ProF 7.8Ah / 15Ah | $179.99–$189.99 / $319.99–$369.99 |
| PENN | 5Ah in-reel (Fathom Electric only) | $119.95 |
Batterysmith undercuts the Florida brands by $50–$100 on a like-for-like pack. What you give up is a known address, a published warranty and a current rating.
Where to buy Batterysmith batteries
Manufacturer (online only)
Further reading
- Batterysmith: Our Story
- Batterysmith blog on Daiwa current draw
- The Hull Truth: battery for electric reel
We didn’t find Batterysmith at Florida tackle shops.
Verdict
Batterysmith offers the widest size range and some of the lowest prices in electric reel batteries, with a charger and reel cable in the box. The 7,000mAh kit at $169 is the sweet spot for one Shimano or Daiwa reel, and at least one angler reports all-day use at 400–800 ft. But the company publishes no address, no current rating, and listings that don’t always agree with each other. Confirm capacity, current rating and warranty with Batterysmith before you buy. If you’d rather have a Florida company and a published warranty, Abyss or Black Oak LED cost more but answer those questions.
Deep-Drop.com rating: Value 4.5/5 · Range 4.5/5 · Spec transparency 2.5/5 · Company transparency 2/5 · US availability 3/5
FAQ
What voltage are Batterysmith reel batteries?
14.8V nominal, 16.8V fully charged. They’re not for 24V Miya Epoch reels.
Do Batterysmith batteries work with a Daiwa Seaborg 800MJ?
Batterysmith sells a cable (option C) for the Seaborg 800MJ–1200MJ. It doesn’t publish a current rating, and Daiwa rates the 800MJ at up to 20 A peak, so ask before using a small pack.
How much is the Batterysmith 7,000mAh kit?
$169 (down from $250) on batterysmith.com in September 2026, with charger, cover and extension cable.
Where is Batterysmith based?
It doesn’t say. The site gives no address or phone number; contact is by web form and social media.
Specifications and prices were checked against batterysmith.com and The Hull Truth on September 28, 2026.