Bluetti B500K expansion battery for Apex 200 ＆ Apex 300 $1519

jasonwc

Yesterday 2:05 PM

3 Comments

Joined Aug 2013

jasonwcYesterday 2:05 PM

3 Comments

FYI, you can use any 51.2V LiFePO4 battery with Bluetti power stations that have a battery expansion port. Watt Cycle sells a custom cable that connects to the battery expansion port on Bluetti power stations (Apex 200, 300 etc.) to a standard ring terminal. It uses 8 AWG high-temperature rated cables and has a built-in 80A fuse, and is rated for 50A continuous current. It's $50 but you can use a 5% off coupon (I used Jasonoid LLC) to drop the price to $45.

You can then hook up the power station to any 5.12V LiFePO4 battery of your choosing. I went with the UL1973/9540A listed Eco-Worthy 51.2V 100Ah Cubix 100, which I acquired from Eco-Worthy's official AliExpress store for $517 ($630 - $110 coupon - $2 perk). This battery has the same capacity as the B500K - 5.12 kWh, bringing the price to 10.1 cents/watt. In contrast, the B500K is 29.7 cents/watt, nearly 3x more expensive. The B500K does have electronic communication with the Bluetti power station, which should help keeping the external and internal batteries balanced. If using your own battery, you will also need a 58.4V battery charger so you can charge your DIY battery to 100% before connecting it to the Bluetti unit (which should also be charged to 100% first), but this is only around $100 and can be used for multiple batteries. This video explains how the setup works with a DIY battery - https://www.youtube.com/watch?v=k3-b13V4isg

See https://slickdeals.net/f/20277234-eco-worthy-cubix100-48v-100ah-5120wh-lifepo4-home-server-rack-battery-526-20-free-s-h?src=SDSearchv3&attrsrc=Thread%3AExpired%3ATrue%7CSearch%3AType%3Anormal%7CSearch%3ASort%3Arecent%7CSearch%3AHideExpired%3Afalse

Will Powers has a good breakdown of the Eco-Worthy 51.2V 100Ah Cubix battery here - https://www.youtube.com/watch?v=4rW7RekF3k8

Last edited by jasonwc November 10, 2026 at 07:08 AM.

1

la9era

Yesterday 5:18 PM

1.1K Comments

Joined Aug 2008

la9eraYesterday 5:18 PM

1.1K Comments

Quote from jasonwc

:

FYI, you can use any 51.2V LiFePO4 battery with Bluetti power stations that have a battery expansion port. Watt Cycle sells a custom cable that connects to the battery expansion port on Bluetti power stations (Apex 200, 300 etc.) to a standard ring terminal. It uses 8 AWG high-temperature rated cables and has a built-in 80A fuse, and is rated for 50A continuous current. It's $50 but you can use a 5% off coupon (I used Jasonoid LLC) to drop the price to $45.

You can then hook up the power station to any 5.12V LiFePO4 battery of your choosing. I went with the UL1973/9540A listed Eco-Worthy 51.2V 100Ah Cubix 100, which I acquired from Eco-Worthy's official AliExpress store for $517 ($630 - $110 coupon - $2 perk). This battery has the same capacity as the B500K - 5.12 kWh, bringing the price to 10.1 cents/watt. In contrast, the B500K is 29.7 cents/watt, nearly 3x more expensive. The B500K does have electronic communication with the Bluetti power station, which should help keeping the external and internal batteries balanced. If using your own battery, you will also need a 58.4V battery charger so you can charge your DIY battery to 100% before connecting it to the Bluetti unit (which should also be charged to 100% first), but this is only around $100 and can be used for multiple batteries. This video explains how the setup works with a DIY battery - https://www.youtube.com/watch?v=k3-b13V4isg

See https://slickdeals.net/f/20277234-eco-worthy-cubix100-48v-100ah-5120wh-lifepo4-home-server-rack-battery-526-20-free-s-h?src=SDSearchv3&attrsrc=Thread%3AExpired%3ATrue%7CSearch%3AType%3Anormal%7CSearch%3ASort%3Arecent%7CSearch%3AHideExpired%3Afalse

Will Powers has a good breakdown of the Eco-Worthy 51.2V 100Ah Cubix battery here - https://www.youtube.com/watch?v=4rW7RekF3k8

Love your explanation.

twiztid83222

Yesterday 5:41 PM

528 Comments

Joined Mar 2009

twiztid83222Yesterday 5:41 PM

528 Comments

Diy is way better than this. Even plugging a battery in a solar port is 5x cheaper

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Bluetti B500K expansion battery for Apex 200 ＆ Apex 300 $1519

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